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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Geoffrey West: The Surprising Math of Cities and Corporations
Physicist Geoffrey West has found that simple, mathematical laws govern the properties of cities -- that wealth, crime rate, walking speed and many other aspects of a city can be deduced from a single number: the city's population. In this mind-bending talk from TEDGlobal he shows how it works and how similar laws hold for organisms and corporations.
Jok Church: A Circle of Caring
In this 3-minute talk, cartoonist and educator Jok Church tells a moving story of the teacher who cared for him when no one else did -- and how he returned the favor.
Space Painter
Creation of a distant world.
Lyndelle Palmer Clarke Wanted a Deeper Meaning to Her Life
This video is about Lyndelle Palmer Clarke's pursuit wanted a deeper meaning to her life.
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.