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John Hunter puts all the problems of the world on a 4′x5′ plywood board - and lets his 4th-graders solve them. At TED2011, he explains how his World Peace Game engages schoolkids, and why the complex lessons it teaches - spontaneous, and always surprising - go further than classroom lectures can.

Steven Pinker charts the decline of violence from Biblical times to the present, and argues that, though it may seem illogical and even obscene, given Iraq and Darfur, we are living in the most peaceful time in our species' existence.