An objective explanation of what happened on September 11, 2001 -- and why the attacks were so significant -- are the focus of today's first story on The World from A to Z. We're also looking at some of the other historic events that occurred on this date. Our international coverage centers on the advent of solar ovens in an East African nation. And we're showing you how scientists turned a flexible sheet into a walking robot.
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- carl azuz, world from a to z, cnn10
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