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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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Annie Murphy Paul: What We Learn Before We're Born

Pop quiz: When does learning begin? Answer: Before we are born. Science writer Annie Murphy Paul talks through new research that shows how much we learn in the womb -- from the lilt of our native language to our soon-to-be-favorite foods.

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When Someone's Not Right

The TODAY show looks into the science behind being left-handed, including a visit to Lefty's at PIER 39.

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

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