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James Hansen: Why I Must Speak Out About Climate Change

Top climate scientist James Hansen tells the story of his involvement in the science of and debate over global climate change. In doing so he outlines the overwhelming evidence that change is happening and why that makes him deeply worried about the future.


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Joan Halifax: Compassion and the True Meaning of Empathy

Buddhist roshi Joan Halifax works with people at the last stage of life (in hospice and on death row). She shares what she's learned about compassion in the face of death and dying, and a deep insight into the nature of empathy.

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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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Simon Sinek talks culture with Zappos CEO Tony Hsieh

Simon Sinek makes a surprise appearance at Zappos. Simon and Tony Hsieh talk about company culture, and Tony shares what he's learned after 20 years of growth at Zappos.

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Dyan deNapoli: The Great Penguin Rescue

A personal story, a collective triumph: Dyan deNapoli tells the story of the world's largest volunteer animal rescue, which saved more than 40,000 penguins after an oil spill off the coast of South Africa. How does a job this big get done? Penguin by penguin by penguin ...

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Jenna McCarthy: What You Don't Know About Marriage

In this funny, casual talk from TEDx, writer Jenna McCarthy shares surprising research on how marriages (especially happy marriages) really work. One tip: Do not try to win an Oscar for best actress.

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