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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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When you look carefully at the way people work, there’s a lot more at play — and at stake — than money. Take a look at 7 studies by the likes of behavioral economist Dan Ariely and psychologist Adam Grant.

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Who should go to Mars? Fancy growing a chair? Top creative thinkers share their thoughts on what the future might look like, in films shot at TED2015 by Jesse Dylan.

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Human beings have made enormous changes to Earth, reshaping it, developing it and generally altering it so much that in many cases its pre-human condition has become unrecognizable. In this far-ranging conversation, ecologist Erle Ellis and landscape architect Bradley Cantrell discuss what this means for ecology and architecture … and how we might think about protecting our planet.

Illustration by Dawn Kim | ideas.ted.com

Do you think your country’s political system is broken? Simon Anholt has a solution: the Good Country Party, which looks beyond borders to include everyone from everywhere.

How to be good at stress | ideas.ted.com

What does it mean to be “good” at stress? Does it mean that you don’t get stressed out? That you stay calm under pressure and bounce back from adversity? Not exactly. Stress researcher Kelly McGonigal shares her surprising findings.

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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.