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
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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'
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.
Secrets of Success in 8 Words, 3 Minutes
Why do people succeed? Is it because they're smart, or are they just lucky? Analyst Richard St. John condenses years of interviews into an unmissable 3-minute presentation on the real secrets of success.