In the talk that opened TEDGlobal 2007 (“Africa: The Next Chapter”), South African investment banker Euvin Naidoo sets the scene, framing the conversation that would unfold over the four-day event. “What’s the worst thing you’ve heard about Africa?” he asks. After fielding call-outs of “famine,” “war,” “corruption,” he urges the audience to move past these preconceptions — and offers a compelling picture of a continent on the cusp of enormous change.