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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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.
Jane Fonda: Life's Third Act
Within this generation, an extra 30 years have been added to our life expectancy -- and these years aren't just a footnote or a pathology. At TEDxWomen, Jane Fonda asks how we can think about this new phase of our lives.
Defying Gravity
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