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Nathalie Cabrol looks for life on Mars by studying extreme places on Earth, where the atmosphere is thin, ultraviolet radiation is high and the temperature is varied. See photos from her expeditions.

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Why in the world did I do that? How can I do better? Chances are you’ve asked yourself these questions at least once today. To understand how your mind works and how you can improve your decision-making, explore these six psychology and behavioral economics books, each one recommended by a renowned thinker.

Get an inside look at the design process behind Fuji Kindergarten, a school where trees grow through classrooms and the roof is another place to play.

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“Lying is a cooperative act,” says professional lie detector Pamela Meyer. “Think about it, a lie has no power whatsoever by its mere utterance. Its power emerges when someone else agrees to believe the lie.” Here, Meyer shares 17 books about truth, dishonesty, and all the gray areas in between.

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In this exclusive TED video, sex ed teacher Al Vernacchio and Make Love Not Porn founder Cindy Gallop discuss why having “the” talk with our kids is not enough.

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Figuring out how to walk from A to B is easy in the age of online mapping tools. Just plug in two addresses and off you go. But sometimes getting to a place as quickly as possible isn’t the priority. Take a look at a project in which researchers tried to figure out a city’s “happy” routes.

Cascadia Expeditions' Brett Gallagher and civil engineer Tyler Deboodt photographed in the entrance to Snow Dragon minutes before sunset in July 2013. Says McGregor, he wouldn't be surprised if the cave was destroyed by 2016. Once skylights form, air flows through the cave at an accelerated rate, which weakens the caves' structure and causes them to collapse.

Explorer Brent McGregor shares stunning photographs of glacier caves discovered within the Sandy Glacier on Oregon’s Mount Hood.