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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Tierney Thys Swims with the Giant Sunfish
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Tony Robbins: Why We Do What We Do, and How We Can Do It Better
Tony Robbins discusses the "invisible forces" that make us do what we do -- and high-fives Al Gore in the front row.
Van Gogh's Starry Night Comes Alive
A try to visualize the flow of the famous painting "Starry Night" of Vincent Van Gogh. The user can interact with the animation. Also, the sound responds to the flow.
Lucianne Walkowicz: Look Up For a Change
Lucianne Walkowicz explains the importance of preserving our dark night sky from the perils of light pollution and other lesser-known factors.
How Great Leaders Inspire Action
Simon Sinek presents a simple but powerful model for how leaders inspire action, starting with a golden circle and the question "Why?" His examples include Apple, Martin Luther King, and the Wright brothers -- and as a counterpoint Tivo, which (until a recent court victory that tripled its stock price) appeared to be struggling.