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What caused the largest extinction 250 million years ago? Unlike the Cretaceous (end of the dinosaurs 65 million years ago).

Neil deGrasse Tyson narrates this 13:15 clip from Nova scienceNow.
Apr 24, 2007 4:15 PM
Re: Nova: The Permian Mass Extinction
Aired on PBS November 21, 2006.

Also available in QT:

http://www.pbs.org/wgbh/nova/sciencenow/video/3318/q01-220.html
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