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New York City was decimated after 9/11, but managed to rebuild itself and become better than ever. How did the city bounce back after that terrible day, and how can cities ravaged by hurricanes in Texas and Florida recreate themselves in the wake of massive destruction? Here to discuss this is Dan Doctoroff, the founder and chief executive officer of Sidewalk Labs, a company that works with cities to build products that address big urban problems.Image credit: Scott Hudson/Flickr