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Ai Weiwei: 'Life is never guaranteed to be safe'

Ai Weiwei, the Chinese artist who will soon take over Tate Modern's Turbine Hall, on why he wants to tell people that it's OK to speak out.


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Sean Carroll: Distant Time and the Hint of a Multiverse

At TEDxCaltech, cosmologist Sean Carroll attacks -- in an entertaining and thought-provoking tour through the nature of time and the universe -- a deceptively simple question: Why does time exist at all? The potential answers point to a surprising view of the nature of the universe, and our place in it.

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Why Good Leaders Make You Feel Safe

What makes a great leader? Management theorist Simon Sinek suggests, it's someone who makes their employees feel secure, who draws staffers into a circle of trust. But creating trust and safety - especially in an uneven economy - means taking on big responsibility.

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Space Painter

Creation of a distant world.

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Seth Shostak: ET is (Probably) Out There -- Get Ready

Dr. Seth Shostak participates in the search for extraterrestrial life at the SETI Institute. He believes ET is out there, and there is a good chance we will discover him soon.

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Hannah Brencher: Love Letters to Strangers

Hannah Brencher's mother always wrote her letters. So when she felt herself bottom into depression after college, she did what felt natural -- she wrote love letters and left them for strangers to find. The act has become a global initiative, The World Needs More Love Letters, which rushes handwritten letters to those in need of a boost.

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