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http://www.youtube.com/channel/UC9MAhZQQd9egwWCxrwSIsJQMega Disasters: Gamma Ray Burst - Full Episode (S2, E2) | History -

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Scientists at the University of Kansas believe gamma ray bursts were responsible for a great mass extinction on Earth 450 million years ago, in Season 2, Episode 2, "Gamma Ray Burst". #MegaDisasters
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