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     xmlns:media="http://search.yahoo.com/mrss/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:pbscontent="http://www.pbs.org/rss/pbscontent/" xmlns:pbsvideo="http://www.pbs.org/rss/pbsvideo/" ><channel><title>NOVA | WNET Video</title><description>NOVA RSS feed for WNET programming.</description><link>http://watch.thirteen.org</link><language>en-us</language><generator>http://watch.thirteen.org</generator><lastBuildDate>Wed, 16 May 2012 16:57:48 -0400</lastBuildDate><pubDate>Wed, 16 May 2012 16:57:48 -0400</pubDate><item><title>NOVA | The Great Inca Rebellion - Preview</title><link>http://watch.thirteen.org/video/2052117201/</link><description>An ancient Peruvian cemetery crammed with disfigued mummies helps explain a long-standing mystery about the Spanish conquest of the Inca Empire. 5/16/2012</description><guid>http://watch.thirteen.org/video/2052117201/</guid><pubDate>07/12/2011</pubDate><media:description>Airs Wednesday, May 16, 2012 at 9:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30733" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/934/53/NOVA-3409-Rebellion-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2052117201/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Forensics &amp; Investigations</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Forensics &amp; Investigations</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Hunt for the Supertwister - Preview</title><link>http://watch.thirteen.org/video/2230315874/</link><description>Take a safe front-row seat to the risky and thrilling art of chasing twisters. 5/9/2012</description><guid>http://watch.thirteen.org/video/2230315874/</guid><pubDate>05/03/2012</pubDate><media:description>Airs Wednesday, May 9, 2012 at 10:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30697" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/79/1019/NOVA-3107-supertwister-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2230315874/" /><category domain="PBS/taxonomy/topic">Health</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health</media:category><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Environment</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Environment</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Deadliest Tornadoes - Preview</title><link>http://watch.thirteen.org/video/2230320253/</link><description>In the wake of April 2011&#39;s tornado outbreak, learn how we can protect ourselves and our communities in the future. 5/9/2012</description><guid>http://watch.thirteen.org/video/2230320253/</guid><pubDate>05/03/2012</pubDate><media:description>Airs Wednesday, May 9, 2012 at 9:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30766" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/79/1024/NOVA-3910-joplin-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2230320253/" /><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Science &amp; Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Technology</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Smartest Machine on Earth - Preview</title><link>http://watch.thirteen.org/video/2226907929/</link><description>Investigate the world of artificial intelligence and the IBM supercomputer named &quot;Watson.&quot; 5/2/2012</description><guid>http://watch.thirteen.org/video/2226907929/</guid><pubDate>04/25/2012</pubDate><media:description>Airs Wednesday, May 2, 2012 at 9:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30766" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/76/763/NOVA-3806-machine-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2226907929/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><category domain="PBS/taxonomy/topic">Communications &amp; Media</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Communications &amp; Media</media:category><category domain="PBS/taxonomy/topic">Transportation &amp; Infrastructure</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Transportation &amp; Infrastructure</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Secrets of the Sun Preview</title><link>http://watch.thirteen.org/video/2207363930/</link><description>Airs April 25, 2012 at 9pm on PBS</description><guid>http://watch.thirteen.org/video/2207363930/</guid><pubDate>03/08/2012</pubDate><media:description>Airs April 25, 2012 at 9pm on PBS</media:description><media:content medium="video" duration="30101" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/58/109/nova-003907-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2207363930/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Secrets of the Sun</title><link>http://watch.thirteen.org/video/2226474716/</link><description>New tools let scientists better grasp our star&#39;s potentially destructive solar storms.</description><guid>http://watch.thirteen.org/video/2226474716/</guid><pubDate>04/26/2012</pubDate><media:description>New tools let scientists better grasp our star&#39;s potentially destructive solar storms.</media:description><media:content medium="video" duration="3186985" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/76/340/nova-003907-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2226474716/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Why Ships Sink</title><link>http://watch.thirteen.org/video/2223857670/</link><description>Are you safe aboard a modern cruise ship?</description><guid>http://watch.thirteen.org/video/2223857670/</guid><pubDate>04/19/2012</pubDate><media:description>Are you safe aboard a modern cruise ship?</media:description><media:content medium="video" duration="3173667" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/73/857/nova-003911-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2223857670/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><category domain="PBS/taxonomy/topic">Transportation &amp; Infrastructure</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Transportation &amp; Infrastructure</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Why Ships Sink Preview</title><link>http://watch.thirteen.org/video/2209108046/</link><description>Airs April 18, 2012 at 9 pm on PBS</description><guid>http://watch.thirteen.org/video/2209108046/</guid><pubDate>03/12/2012</pubDate><media:description>Airs April 18, 2012 at 9 pm on PBS</media:description><media:content medium="video" duration="30101" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/59/789/nova-003911-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2209108046/" /><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Science &amp; Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Technology</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><category domain="PBS/taxonomy/topic">Transportation &amp; Infrastructure</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Transportation &amp; Infrastructure</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Deadliest Tornadoes Preview</title><link>http://watch.thirteen.org/video/2209165318/</link><description>Airs April 11, 2012 at 9pm on PBS</description><guid>http://watch.thirteen.org/video/2209165318/</guid><pubDate>03/12/2012</pubDate><media:description>Airs April 11, 2012 at 9pm on PBS</media:description><media:content medium="video" duration="30066" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/59/845/nova-003910-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2209165318/" /><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Deadliest Tornadoes</title><link>http://watch.thirteen.org/video/2220853400/</link><description>Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?</description><guid>http://watch.thirteen.org/video/2220853400/</guid><pubDate>04/12/2012</pubDate><media:description>Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?</media:description><media:content medium="video" duration="3172635" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/70/995/nova-003910-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2220853400/" /><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Introducing NOVA&#39;s Sun Lab</title><link>http://watch.thirteen.org/video/2221363813/</link><description>Learn about solar storms and do your own research using images from NASA telescopes.</description><guid>http://watch.thirteen.org/video/2221363813/</guid><pubDate>04/13/2012</pubDate><media:description>Learn about solar storms and do your own research using images from NASA telescopes.</media:description><media:content medium="video" duration="133133" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/71/469/Sun-Lab-Line-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2221363813/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Threat to Earth</title><link>http://watch.thirteen.org/video/2221031998/</link><description>NOVA Labs: What would happen if a solar storm overwhelmed Earth&#39;s natural defenses?</description><guid>http://watch.thirteen.org/video/2221031998/</guid><pubDate>04/10/2012</pubDate><media:description>NOVA Labs: What would happen if a solar storm overwhelmed Earth&#39;s natural defenses?</media:description><media:content medium="video" duration="152800" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/71/145/2C-threat-to-earth-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2221031998/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | How Can I Study the Sun?</title><link>http://watch.thirteen.org/video/2221363815/</link><description>NOVA Labs: Learn how to use the Helioviewer, a tool at the heart of NOVA&#39;s Sun Lab.</description><guid>http://watch.thirteen.org/video/2221363815/</guid><pubDate>04/19/2012</pubDate><media:description>NOVA Labs: Learn how to use the Helioviewer, a tool at the heart of NOVA&#39;s Sun Lab.</media:description><media:content medium="video" duration="197933" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/71/469/3C-how-can-i-study-sun-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2221363815/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Earth&#39;s Magnetic Shield</title><link>http://watch.thirteen.org/video/2221031996/</link><description>NOVA Labs will launch May, 2012.</description><guid>http://watch.thirteen.org/video/2221031996/</guid><pubDate>04/10/2012</pubDate><media:description>NOVA Labs will launch May, 2012.</media:description><media:content medium="video" duration="125267" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/71/145/2B-earth-magnetic-shield-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2221031996/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Solar Space Telescopes</title><link>http://watch.thirteen.org/video/2221147727/</link><description>NOVA Labs: New solar telescopes are allowing us to see the Sun like never before.</description><guid>http://watch.thirteen.org/video/2221147727/</guid><pubDate>04/10/2012</pubDate><media:description>NOVA Labs: New solar telescopes are allowing us to see the Sun like never before.</media:description><media:content medium="video" duration="230867" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/71/258/3B-solar-telescopes-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2221147727/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Sun&#39;s Energy</title><link>http://watch.thirteen.org/video/2219799161/</link><description>NOVA Labs: What are the processes that produce the Sun&#39;s light and heat?</description><guid>http://watch.thirteen.org/video/2219799161/</guid><pubDate>04/09/2012</pubDate><media:description>NOVA Labs: What are the processes that produce the Sun&#39;s light and heat?</media:description><media:content medium="video" duration="126133" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/69/989/1B-sun-energy-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2219799161/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Dynamic Sun</title><link>http://watch.thirteen.org/video/2219781960/</link><description>NOVA Labs: Magnetism influences when and how solar storms erupt.</description><guid>http://watch.thirteen.org/video/2219781960/</guid><pubDate>04/09/2012</pubDate><media:description>NOVA Labs: Magnetism influences when and how solar storms erupt.</media:description><media:content medium="video" duration="197800" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/69/972/1C-dynamic-sun-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2219781960/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Electromagnetic Spectrum</title><link>http://watch.thirteen.org/video/2219781967/</link><description>NOVA Labs: Most of what we know about solar science comes from reading the Sun&#39;s light.</description><guid>http://watch.thirteen.org/video/2219781967/</guid><pubDate>04/09/2012</pubDate><media:description>NOVA Labs: Most of what we know about solar science comes from reading the Sun&#39;s light.</media:description><media:content medium="video" duration="175933" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/69/972/3A-electromagnetic-spectrum-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2219781967/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Anatomy of the Sun</title><link>http://watch.thirteen.org/video/2219781957/</link><description>NOVA Labs: How does the Sun&#39;s composition influence its behavior?</description><guid>http://watch.thirteen.org/video/2219781957/</guid><pubDate>04/09/2012</pubDate><media:description>NOVA Labs: How does the Sun&#39;s composition influence its behavior?</media:description><media:content medium="video" duration="202000" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/69/972/1A-anatomy-sun-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2219781957/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Solar Wind and Storms</title><link>http://watch.thirteen.org/video/2219781964/</link><description>NOVA Labs: Bursts of plasma released by the Sun create &quot;space weather&quot; around our planet.</description><guid>http://watch.thirteen.org/video/2219781964/</guid><pubDate>04/09/2012</pubDate><media:description>NOVA Labs: Bursts of plasma released by the Sun create &quot;space weather&quot; around our planet.</media:description><media:content medium="video" duration="167133" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/69/972/2A-solar-wind-storms-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2219781964/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Understanding Solar Activity</title><link>http://watch.thirteen.org/video/2219505344/</link><description>What factors make the sun more or less volatile?</description><guid>http://watch.thirteen.org/video/2219505344/</guid><pubDate>04/05/2012</pubDate><media:description>What factors make the sun more or less volatile?</media:description><media:content medium="video" duration="451067" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/69/702/understanding-solar-activity-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2219505344/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><category domain="PBS/taxonomy/topic">Space</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Space</media:category><pbsvideo:content_type>Clip</pbsvideo:content_type></item><item><title>NOVA | Hunting the Elements</title><link>http://watch.thirteen.org/video/2217713569/</link><description>A two-hour special from the producers of &quot;Making Stuff&quot;</description><guid>http://watch.thirteen.org/video/2217713569/</guid><pubDate>04/05/2012</pubDate><media:description>A two-hour special from the producers of &quot;Making Stuff&quot;</media:description><media:content medium="video" duration="6787668" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/67/1000/nova-003906_2-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2217713569/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Hunting the Elements Promo</title><link>http://watch.thirteen.org/video/2185064316/</link><description>Premiering April 4, 2012 on PBS</description><guid>http://watch.thirteen.org/video/2185064316/</guid><pubDate>01/09/2012</pubDate><media:description>Premiering April 4, 2012 on PBS</media:description><media:content medium="video" duration="250560" /><media:thumbnail url="http://www-tc.pbs.org/video/media/images/assets/videos/2185064316/2185064316_ThumbnailCOVEDefault.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2185064316/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | NOVA Elements iPad App</title><link>http://watch.thirteen.org/video/2218625000/</link><description>Explore an interactive periodic table, play an elemental game, and watch the NOVA program.</description><guid>http://watch.thirteen.org/video/2218625000/</guid><pubDate>04/02/2012</pubDate><media:description>Explore an interactive periodic table, play an elemental game, and watch the NOVA program.</media:description><media:content medium="video" duration="273067" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/68/866/elements-app-promo-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2218625000/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Cracking Your Genetic Code</title><link>http://watch.thirteen.org/video/2215641935/</link><description>We are on the brink of a new era of personalized, gene-based medicine. Are we ready for it?</description><guid>http://watch.thirteen.org/video/2215641935/</guid><pubDate>03/29/2012</pubDate><media:description>We are on the brink of an era of personalized, gene-based medicine. Are we ready for it?</media:description><media:content medium="video" duration="3207163" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/66/1/nova-003909-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2215641935/" /><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Cracking Your Genetic Code Preview</title><link>http://watch.thirteen.org/video/2195620092/</link><description>Premiering March 28, 2012 at 9pm on PBS</description><guid>http://watch.thirteen.org/video/2195620092/</guid><pubDate>02/13/2012</pubDate><media:description>Premiering March 28, 2012 at 9pm on PBS</media:description><media:content medium="video" duration="44160" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/46/929/nova-003909-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2195620092/" /><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Social Issues</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Social Issues</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Elemental Bloopers</title><link>http://watch.thirteen.org/video/2215924772/</link><description>Watch David Pogue&#39;s hilarious out-takes from NOVA&#39;s &quot;Hunting the Elements.&quot;</description><guid>http://watch.thirteen.org/video/2215924772/</guid><pubDate>03/27/2012</pubDate><media:description>Watch David Pogue&#39;s hilarious out-takes from NOVA&#39;s &quot;Hunting the Elements.&quot;</media:description><media:content medium="video" duration="166254" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/66/278/elemental-bloopers-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2215924772/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Chemotherapy and Breast Cancer</title><link>http://watch.thirteen.org/video/2212210273/</link><description>For some breast cancer patients, chemotherapy isn&#39;t always necessary.</description><guid>http://watch.thirteen.org/video/2212210273/</guid><pubDate>03/21/2012</pubDate><media:description>For some breast cancer patients, chemotherapy isn&#39;t always necessary.</media:description><media:content medium="video" duration="185248" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/62/746/nova-minimizing_chemo-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2212210273/" /><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Extreme Ice - Preview</title><link>http://watch.thirteen.org/video/2209165346/</link><description>Investigate the mystery of the melting ice sheets that will affect the fate of coastlines around the world. 3/21/2012</description><guid>http://watch.thirteen.org/video/2209165346/</guid><pubDate>03/12/2012</pubDate><media:description>Airs Wednesday, March 21, 2012 at 9:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30789" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/59/845/NOVA-3604-ice-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2209165346/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Environment</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Environment</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Mind Over Money - Preview</title><link>http://watch.thirteen.org/video/2204103679/</link><description>Discover the mysterious and surprising nature of the two most powerful forces on the planet: the human mind and money. 3/7/2012</description><guid>http://watch.thirteen.org/video/2204103679/</guid><pubDate>03/01/2012</pubDate><media:description>Airs Wednesday, March 7, 2012 at 9:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30720" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/54/1021/NOVA-3707-money-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2204103679/" /><category domain="PBS/taxonomy/topic">Culture &amp; Society</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Culture &amp; Society</media:category><category domain="PBS/taxonomy/topic">People &amp; Profiles</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">People &amp; Profiles</media:category><category domain="PBS/taxonomy/topic">Health</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health</media:category><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Business &amp; Economy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Business &amp; Economy</media:category><category domain="PBS/taxonomy/topic">Opinion</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Opinion</media:category><category domain="PBS/taxonomy/topic">Science &amp; Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Technology</media:category><category domain="PBS/taxonomy/topic">Social Issues</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Social Issues</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Japan&#39;s Killer Quake - Preview</title><link>http://watch.thirteen.org/video/2199654935/</link><description>Get a unique look at the science behind Japan&#39;s catastrophic 2011 earthquake. 3/5/2012</description><guid>http://watch.thirteen.org/video/2199654935/</guid><pubDate>02/21/2012</pubDate><media:description>Airs Monday, March 5, 2012 at 10:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30766" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/50/773/NOVA-3810-japan-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2199654935/" /><category domain="PBS/taxonomy/topic">Health</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health</media:category><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Global Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Global Affairs</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Environment</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Environment</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Extract Your Own DNA</title><link>http://watch.thirteen.org/video/2203057166/</link><description>Behold your very own DNA in this do-it-yourself science experiment.</description><guid>http://watch.thirteen.org/video/2203057166/</guid><pubDate>02/29/2012</pubDate><media:description>Behold your very own DNA in this do-it-yourself science experiment.</media:description><media:content medium="video" duration="165952" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/53/1024/how-to-extract-DNA-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2203057166/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Origins: Earth Is Born Preview</title><link>http://watch.thirteen.org/video/2199710642/</link><description>Journey back to the beginning of everything: the universe, Earth, and life itself.</description><guid>http://watch.thirteen.org/video/2199710642/</guid><pubDate>02/21/2012</pubDate><media:description>Journey back to the beginning of everything: the universe, Earth, and life itself.</media:description><media:content medium="video" duration="30101" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/50/827/origins-earth-is-born-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2199710642/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Separating Twins</title><link>http://watch.thirteen.org/video/2193535054/</link><description>Follow the story of twin girls joined at the head, as surgeons prepare to separate them.</description><guid>http://watch.thirteen.org/video/2193535054/</guid><pubDate>02/09/2012</pubDate><media:description>Follow the story of twin girls joined at the head, as surgeons prepare to separate them.</media:description><media:content medium="video" duration="3182085" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/44/941/nova-003908-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2193535054/" /><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biography &amp; Profiles</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biography &amp; Profiles</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Separating Twins Preview</title><link>http://watch.thirteen.org/video/2183490958/</link><description>Premiering Feb. 8, 2012 on PBS</description><guid>http://watch.thirteen.org/video/2183490958/</guid><pubDate>01/04/2012</pubDate><media:description>Premiering Winter 2012 on PBS</media:description><media:content medium="video" duration="30101" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/35/348/nova-003908-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2183490958/" /><category domain="PBS/taxonomy/topic">Health Care &amp; Illnesses</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Health Care &amp; Illnesses</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Drinking &quot;Mastodon Juice&quot;</title><link>http://watch.thirteen.org/video/2191745251/</link><description>Forget Happy Hour. These scientists drink water trapped in Ice Age bones.</description><guid>http://watch.thirteen.org/video/2191745251/</guid><pubDate>01/31/2012</pubDate><media:description>Forget Happy Hour. These scientists drink water trapped in Ice Age bones.</media:description><media:content medium="video" duration="59712" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/43/217/drinking-mastodon-juice-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2191745251/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Mystery of a Masterpiece Preview</title><link>http://watch.thirteen.org/video/2183490953/</link><description>Premiering January 25, 2012 at 9pm on PBS</description><guid>http://watch.thirteen.org/video/2183490953/</guid><pubDate>01/05/2012</pubDate><media:description>Premiering January 25, 2012 at 9pm on PBS</media:description><media:content medium="video" duration="30101" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/35/348/nova-003904-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2183490953/" /><category domain="PBS/taxonomy/topic">Arts &amp; Entertainment</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Arts &amp; Entertainment</media:category><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">Renaissance</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Renaissance</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Mystery of a Masterpiece</title><link>http://watch.thirteen.org/video/2189483449/</link><description>Experts investigate whether a portrait sold for about $20,000 in 1998 is a lost Leonardo.</description><guid>http://watch.thirteen.org/video/2189483449/</guid><pubDate>01/26/2012</pubDate><media:description>Experts investigate whether a portrait sold for about $20,000 in 1998 is a lost Leonardo.</media:description><media:content medium="video" duration="3172565" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/41/56/nova-003904-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2189483449/" /><category domain="PBS/taxonomy/topic">Arts &amp; Entertainment</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Arts &amp; Entertainment</media:category><category domain="PBS/taxonomy/topic">Fine Arts</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Fine Arts</media:category><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">Renaissance</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Renaissance</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | 3D Spies of WWII Preview</title><link>http://watch.thirteen.org/video/2175892459/</link><description>Premiering January 18, 2012 at 9 pm on PBS</description><guid>http://watch.thirteen.org/video/2175892459/</guid><pubDate>12/13/2011</pubDate><media:description>Premiering January 18, 2012 at 9 pm on PBS</media:description><media:content medium="video" duration="30066" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/28/95/nova-003903-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2175892459/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">War &amp; Conflict</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">War &amp; Conflict</media:category><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">National Security</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">National Security</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | 3D Spies of WWII</title><link>http://watch.thirteen.org/video/2187853726/</link><description>With 3D graphics, NOVA reveals how the Allies used special aerial photos to deal a dire blow to the Nazi rocket program.</description><guid>http://watch.thirteen.org/video/2187853726/</guid><pubDate>01/19/2012</pubDate><media:description>The Allies used special aerial photos to deal a dire blow to the Nazi rocket program.</media:description><media:content medium="video" duration="3187240" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/39/512/nova-003903-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2187853726/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">War &amp; Conflict</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">War &amp; Conflict</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><category domain="PBS/taxonomy/topic">Transportation &amp; Infrastructure</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Transportation &amp; Infrastructure</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Sneak Peak: 3D Spies of WWII</title><link>http://watch.thirteen.org/video/2186608380/</link><description>Premiering January 18, 2012 at 9pm on PBS</description><guid>http://watch.thirteen.org/video/2186608380/</guid><pubDate>01/13/2012</pubDate><media:description>Premiering January 18, 2012 at 9pm on PBS</media:description><media:content medium="video" duration="316117" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/38/320/sneak-peak-3d-spies-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2186608380/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">War &amp; Conflict</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">War &amp; Conflict</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Bombing Hitler&#39;s Dams</title><link>http://watch.thirteen.org/video/2184994583/</link><description>Can experts recreate an Allied attack from WWII and destroy dams with a bouncing bomb?</description><guid>http://watch.thirteen.org/video/2184994583/</guid><pubDate>01/12/2012</pubDate><media:description>Can experts recreate an Allied attack from WWII and destroy dams with a bouncing bomb?</media:description><media:content medium="video" duration="6772239" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/36/792/nova-003902-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2184994583/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">War &amp; Conflict</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">War &amp; Conflict</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Technology</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Technology</media:category><category domain="PBS/taxonomy/topic">Transportation &amp; Infrastructure</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Transportation &amp; Infrastructure</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Bombing Hitler&#39;s Dams Preview</title><link>http://watch.thirteen.org/video/2175888290/</link><description>Premiering January 11, 2012 at 9 pm on PBS</description><guid>http://watch.thirteen.org/video/2175888290/</guid><pubDate>12/13/2011</pubDate><media:description>Premiering January 11, 2012 at 9 pm on PBS</media:description><media:content medium="video" duration="30144" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/28/91/nova-003902-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2175888290/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">War &amp; Conflict</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">War &amp; Conflict</media:category><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">National Security</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">National Security</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Deadliest Volcanoes Preview</title><link>http://watch.thirteen.org/video/2175888293/</link><description>Premiering January 4, 2012 at 9 pm on PBS</description><guid>http://watch.thirteen.org/video/2175888293/</guid><pubDate>12/13/2011</pubDate><media:description>Premiering January 4, 2012 at 9 pm on PBS</media:description><media:content medium="video" duration="30066" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/28/91/nova-003901-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2175888293/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Deadliest Volcanoes</title><link>http://watch.thirteen.org/video/2182459039/</link><description>How can we best prepare for the most lethal volcanic eruptions?</description><guid>http://watch.thirteen.org/video/2182459039/</guid><pubDate>01/05/2012</pubDate><media:description>How can we best prepare for the most lethal volcanic eruptions?</media:description><media:content medium="video" duration="3165994" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/34/364/nova-003901-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2182459039/" /><category domain="PBS/taxonomy/topic">News &amp; Public Affairs</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">News &amp; Public Affairs</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Ice Age Death Trap Preview</title><link>http://watch.thirteen.org/video/2183288240/</link><description>Premiering Winter 2012 on PBS</description><guid>http://watch.thirteen.org/video/2183288240/</guid><pubDate>01/04/2012</pubDate><media:description>Premiering Winter 2012 on PBS</media:description><media:content medium="video" duration="30144" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/35/150/nova-003905-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2183288240/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Deadliest Earthquakes Preview</title><link>http://watch.thirteen.org/video/1690329015/</link><description>Big quakes are inevitable, but can we prevent their devastation?</description><guid>http://watch.thirteen.org/video/1690329015/</guid><pubDate>12/10/2010</pubDate><media:description>Watch January 4, 2012 on PBS</media:description><media:content medium="video" duration="30000" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/589/24/nova-003801-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/1690329015/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Sneak Peak: Deadliest Volcanoes</title><link>http://watch.thirteen.org/video/2177414412/</link><description>Could tiny particles called muons allow us to see deep inside volcanoes?</description><guid>http://watch.thirteen.org/video/2177414412/</guid><pubDate>12/16/2011</pubDate><media:description>Could tiny particles called muons allow us to see deep inside volcanoes?</media:description><media:content medium="video" duration="382200" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/29/558/sneak-peak-volcanoes-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2177414412/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><pbsvideo:content_type>Clip</pbsvideo:content_type></item><item><title>NOVA | Mystery of the Megavolcano - Preview</title><link>http://watch.thirteen.org/video/2173743445/</link><description>Watch as NOVA pieces together clues about a volcanic cataclysm and probes questions about human evolution and Earth&#39;s fragile ecosystems. 12/14/2011</description><guid>http://watch.thirteen.org/video/2173743445/</guid><pubDate>12/06/2011</pubDate><media:description>Airs Wednesday, December 14, 2011 at 10:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30696" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/26/45/NOVA-3312-megavolcano-COVE-THUMB.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2173743445/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><category domain="PBS/taxonomy/topic">Environment</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Environment</media:category><category domain="PBS/taxonomy/topic">Weather &amp; Natural Disasters</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Weather &amp; Natural Disasters</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | Light My Fire</title><link>http://watch.thirteen.org/video/2175892485/</link><description>What do you get when you introduce a chunk of Sodium to a Bunsen burner? Sizzling romance.</description><guid>http://watch.thirteen.org/video/2175892485/</guid><pubDate>12/13/2011</pubDate><media:description>What do you get when you introduce a chunk of Sodium to a Bunsen burner? Sizzling romance.</media:description><media:content medium="video" duration="78592" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/28/96/light-my-fire-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2175892485/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | Darwin&#39;s Darkest Hour - Preview</title><link>http://watch.thirteen.org/video/2172993848/</link><description>Witness Charles Darwin&#39;s greatest personal crisis: the anguishing decision over whether to &quot;go public&quot; with his theory of evolution. 12/7/2011</description><guid>http://watch.thirteen.org/video/2172993848/</guid><pubDate>12/02/2011</pubDate><media:description>Airs Wednesday, December 7, 2011 at 9:00 p.m. ET/PT. Check your local listings.</media:description><media:content medium="video" duration="30720" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_Promotions/25/337/NOVA-3605-darwin-COVE-THUMb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2172993848/" /><category domain="PBS/taxonomy/topic">History</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">History</media:category><category domain="PBS/taxonomy/topic">Modern</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Modern</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Biography &amp; Profiles</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biography &amp; Profiles</media:category><category domain="PBS/taxonomy/topic">Biology &amp; Chemistry</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Biology &amp; Chemistry</media:category><category domain="PBS/taxonomy/topic">Earth</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Earth</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | The Fabric of the Cosmos: Universe or Multiverse?</title><link>http://watch.thirteen.org/video/2168433605/</link><description>Is our universe unique, or could it be just one in an endless &quot;multiverse&quot;?</description><guid>http://watch.thirteen.org/video/2168433605/</guid><pubDate>11/24/2011</pubDate><media:description>Is our universe unique, or could it be just one in an endless &quot;multiverse&quot;?</media:description><media:content medium="video" duration="3171567" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/20/1003/fabric-multiverse-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2168433605/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Sneak Peak: Universe or Multiverse?</title><link>http://watch.thirteen.org/video/2168401190/</link><description>We may live in an expanding sea of multiplying universes: the multiverse.</description><guid>http://watch.thirteen.org/video/2168401190/</guid><pubDate>11/21/2011</pubDate><media:description>We may live in an expanding sea of multiplying universes: the multiverse.</media:description><media:content medium="video" duration="249365" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/20/972/sneak-peak-multiverse-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2168401190/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Fabric of the Cosmos: Quantum Leap</title><link>http://watch.thirteen.org/video/2167398185/</link><description>Take a wild ride into the quantum realm, where even the impossible seems possible.</description><guid>http://watch.thirteen.org/video/2167398185/</guid><pubDate>11/17/2011</pubDate><media:description>Take a wild ride into the quantum realm, where even the impossible seems possible.</media:description><media:content medium="video" duration="3172031" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/19/1016/nova-003818-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2167398185/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | The Amazing Atomic Clock</title><link>http://watch.thirteen.org/video/2167682634/</link><description>Dr. Steve Jefferts of the National Institute of Standards and Technology in Boulder, Colorado is an expert on how we measure time. In fact, he uses one of the world&#39;s most accurate atomic clocks to calibrate time in the United States. But why do we need such accuracy? Learn why atomic clocks are so important in our everyday lives.</description><guid>http://watch.thirteen.org/video/2167682634/</guid><pubDate>11/16/2011</pubDate><media:description>What are atomic clocks? And why do we need them?</media:description><media:content medium="video" duration="239786" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/20/270/atomic-clock-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2167682634/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Fabric of the Cosmos: The Illusion of Time</title><link>http://watch.thirteen.org/video/2164065493/</link><description>It defines our lives, but what is time really? Have a look into its true nature.</description><guid>http://watch.thirteen.org/video/2164065493/</guid><pubDate>11/10/2011</pubDate><media:description>It defines our lives, but what is time really? Have a look into its true nature.</media:description><media:content medium="video" duration="3172200" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/16/834/fabric-time-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2164065493/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | NOVA&#39;s The Fabric of the Cosmos Goes to NY Comic Con</title><link>http://watch.thirteen.org/video/2159925160/</link><description>At the New York Comic Con convention, physicist and author Brian Greene discusses NOVA&#39;s The Fabric of the Cosmos (airing on PBS beginning Nov. 2, 2011).</description><guid>http://watch.thirteen.org/video/2159925160/</guid><pubDate>10/25/2011</pubDate><media:description>Physicist Brian Greene discusses NOVA&#39;s The Fabric of the Cosmos at NY Comic Con.</media:description><media:content medium="video" duration="96107" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_General_Audience/12/886/NOVA-FabricCosmos-ComicCon-small.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2159925160/" /><category domain="PBS/taxonomy/topic">Culture &amp; Society</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Culture &amp; Society</media:category><category domain="PBS/taxonomy/topic">Antiques &amp; Collectibles</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Antiques &amp; Collectibles</media:category><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Astronomy</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Astronomy</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item><item><title>NOVA | The Fabric of the Cosmos Preview</title><link>http://watch.thirteen.org/video/2088252846/</link><description>Acclaimed physicist Brian Greene reveals a mind-boggling reality beneath the surface of our everyday world. Series premieres November 2, 2011 at 9pm on PBS</description><guid>http://watch.thirteen.org/video/2088252846/</guid><pubDate>08/10/2011</pubDate><media:description>Series premieres November 2, 2011 at 9pm on PBS</media:description><media:content medium="video" duration="188400" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/968/526/fabric-overview-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2088252846/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Promotion</pbsvideo:content_type></item><item><title>NOVA | The Fabric of the Cosmos: What Is Space?</title><link>http://watch.thirteen.org/video/2163057527/</link><description>Surprising clues indicate that space is very much something and not nothing.</description><guid>http://watch.thirteen.org/video/2163057527/</guid><pubDate>11/03/2011</pubDate><media:description>Surprising clues indicate that space is very much something and not nothing.</media:description><media:content medium="video" duration="3172426" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/15/873/fabric-space-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2163057527/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Episode</pbsvideo:content_type></item><item><title>NOVA | Quantum Confidential</title><link>http://watch.thirteen.org/video/2163191974/</link><description>If you were a spy, how could you ensure that an encrypted message got safely to your allies? Send it using entangled particles! Here, watch how a technique called quantum cryptography could save a state secret from falling into enemy hands.</description><guid>http://watch.thirteen.org/video/2163191974/</guid><pubDate>11/01/2011</pubDate><media:description>Learn how to send top-secret messages using quantum mechanics.</media:description><media:content medium="video" duration="138581" /><media:thumbnail url="http://www-tc.pbs.org/cove-media/http/PBS_CP_NOVA/15/1005/quantum-confidential-thumb.jpg" type="image/jpeg" height="60" width="142" /><media:player url="http://watch.thirteen.org/video/2163191974/" /><category domain="PBS/taxonomy/topic">Science &amp; Nature</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Science &amp; Nature</media:category><category domain="PBS/taxonomy/topic">Physics &amp; Mathematics</category><media:category scheme="http://www.pbs.org/rss/pbscontent/taxonomy/topic">Physics &amp; Mathematics</media:category><pbsvideo:content_type>Segment</pbsvideo:content_type></item></channel></rss>

