How Zak Ebrahim struggled--and succeeded--to break away from a culture of hate.
Before 9/11, only a few dedicated law-enforcement and intelligence agents understood the enormity of the terrorists' ambitions. And they had a hard time convincing their bosses.
Forty years ago, New York awoke to find Philippe Petit walking on a wire between the 110-story Twin Towers of the World Trade Center.
Using tree rings, scientists have identified the origins of a wooden ship unearthed at the former World Trade Center site in Manhattan four years ago.
As its record-topping spire is installed, find out more about the building that has already become a New York icon.
A bombing of the World Trade Center in 1993 proved to be a frightening prelude to future acts of terrorism.