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NOVA scienceNOW Season 4 Episode 3 Marathon Mouse/Dinosaur Plague/Franklin Chang-Díaz/Space Storms 2009

Watch how an "exercise pill" turns couch-potato mice into athletes, explore a controversial new theory of what killed the dinosaurs, meet the first Latino-American astronaut, and find out why the beautiful northern lights signal a threat to our electronic society.

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Download : MP4

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