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On September 11, 2001, Elizabeth A. Phelps stepped outside her apartment in lower Manhattan and noticed a man staring toward the World Trade Center, about two miles away.

From building-blocking bollards to millimeter-wave scanners , the September 11 terrorist attacks have led to significant changes in security techniques and technology worldwide over the past decade to discourage future attacks and to avoid being surprised again. To meet these goals, law enforcement and counterterrorism operations worldwide have come to rely heavily on surveillance of public spaces. Nowhere is surveillance more pervasive in the U.S

A new, safer model of skyscraper rises from the site of the attack. Photo by Ofer Wolberger The offices here at Fast Company enjoy a most remarkable view. From our aerie on the 29th floor of 7 World Trade Center, we look out over the New York harbor, Ellis Island, the Statue of Liberty, and the occasional jetliner floating down the Hudson.

For most Americans, as the nation's thoughts turn to the 10th anniversary of the 9/11 terrorist attacks, memories of that day readily come flooding back. People can remember with great clarity what they were doing or to whom they were speaking when they learned of the crisis--whether via a sister's phone call or a first-hand glimpse of the World Trade Center on fire. [More]

For months, many New York City firefighters worked in the toxic air at ground zero, digging through the rubble of the World Trade Center. Now, as Dr

Even veteran disaster investigators were stunned by the fall of the Twin Towers on September 11, 2001 .