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  • An Interview With Sally Ride Watch an uncut interview with the late astronaut, conducted in 1984, and hear her views on being the first American woman in space. Watch now.

  • Ultimate Mars Challenge In its search for life beyond Earth, NASA deploys a new "sky crane" to land the Curiosity rover on Mars. Watch a preview.

  • Cleaner Cookstoves in Uganda Changing the way women cook may help protect the environment and reduce the incidence of sexual assault in Uganda. Hear from Ari Daniel Shapiro.

  • Anatomy of a $100 Bill See how currency designers at the Bureau of Engraving and Printing revamped the Franklin to thwart counterfeiters. Learn how they did it.

  • Fit to Go the Distance How does regular exercise transform your body and enable even novice runners to finish a marathon? Read the article.

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