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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Optical Illusion: Perspective is Everything
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The Fifth Agreement: A Toltec Wisdom Interview with Don Miguel Ruiz
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Defying Gravity
What happens in our brain when we view an optical illusion? The information gathered by the eye is processed in the brain to create an idea or image that does not match with a physical measurement of the stimulus source.
The Skin Gun
A simple idea backed by stem cell research allows victims of severe burns to heal in merely days.
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