Ted

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Jonathan Klein: Photos that changed the world. Wadah Khanfar: A historic moment in the Arab world. Hans Rosling: The good news of the decade? Tom Chatfield: 7 ways games reward the brain. David Hoffman shares his Sputnik mania. Jonathan Harris: the Web's secret stories. Jonathan Harris collects stories. Clifford Stoll on ... everything.

Gever Tulley teaches life lessons through tinkering. Charles Leadbeater: Education innovation in the slums. We Think. Taylor Mali: What teachers make. Emily Pilloton: Teaching design for change. Salman Khan: Let's use video to reinvent education.

Dave Eggers' wish: Once Upon a School. Kiran Bir Sethi teaches kids to take charge. Cameron Herold: Let's raise kids to be entrepreneurs. Adora Svitak: What adults can learn from kids. Ali Carr-Chellman: Gaming to re-engage boys in learning. Phil Borges on endangered cultures. Wade Davis on endangered cultures. Wade Davis on the worldwide web of belief and ritual. Ben Cameron: The true power of the performing arts.

Liza Donnelly: Drawing upon humor for change. TED: Ideas worth spreading. Douglas Adams: Parrots, the universe and everything.