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.
Other Videos That May Interest You:
Why Good Leaders Make You Feel Safe
What makes a great leader? Management theorist Simon Sinek suggests, it's someone who makes their employees feel secure, who draws staffers into a circle of trust. But creating trust and safety - especially in an uneven economy - means taking on big responsibility.
Ultimate Dog Tease
A Dog's Life - Someone Give That Dog Some Bacon!
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.
Alexander Tsiaras: Conception to Birth - Visualized
Image-maker Alexander Tsiaras shares a powerful medical visualization, showing human development from conception to birth and beyond. (Some graphic images.)
The Skin Gun
A simple idea backed by stem cell research allows victims of severe burns to heal in merely days.