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Marathon Mouse - July 2009With an "exercise pill," researchers turn couch-potato rodents into champion runners.
Dinosaur Plague - July 2009Insects caught in amber spark a controversial theory about what killed the dinosaurs.
Profile: Franklin Chang-Díaz - July 2009 The first Latino-American astronaut is also a scientist designing a new generation of plasma-powered space vehicles.
Space Storms - July 2008Behind the dazzling display of the aurora borealis are space storms that could turn the lights off here on Earth.
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