Marathon Mouse/Dinosaur Plague/Franklin Chang-Díaz/Space Storms

14th July 2009 Season 4 Episode 3

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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Season 4 · Episode 4

Picky Eaters/Capturing Carbon/Sea Lions and Walruses/Sangeeta Bhatia

Discover why picky eaters may have a genetic excuse, learn about a new strategy for capturing carbon dioxide from the atmosphere, see just how intelligent marine mammals can be, and meet a biomedical engineer who has figured out a way to make tiny livers in her lab.

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