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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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.