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Learn more about the underground worlds fighting for survival
Scientists in the Utah desert are trying to find out if humans would be able to survive on Mars. For two weeks, the researchers have limited amounts of oxygen, water, food and...
View photos from the effects of a a 10-ton meteor that exploded several miles over Russia on February 15
Scientists in China wear panda costumes as a disguise when approaching endangered giant pandas. View a slide show to see them in action.
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