Marathon Mouse/Dinosaur Plague/Franklin Chang-Díaz/Space Storms - S4.E3
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.
Marathon Mouse/Dinosaur Plague/Franklin Chang-Díaz/Space Storms - S4.E3
July 14, 2009
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