The agile lemur inspires a four-legged NASA automaton that will roam Martian terrain too extreme for wheeled rovers

Exploring the intricacies of Martian geology requires a steady climber, nimble enough to scale cliffs and dexterous enough to sample the strata. A climbing primate would be a good candidate, if only there were air to breathe and the temperature were warmer than -140

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November 2009: Astronaut 3.0

Inside NASA's astronaut bootcamp and the grueling new training regimen for deep space. Plus, ten young geniuses shaking up science today, one writer's quest to analyze every man-made chemical in her body and more.

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