Why is New York City so safe?

It estimated that in the next decade as much as seventy percent of the world's population will be living in cities. How we make those cities safe, may very well determine the quality of life for future generations. There is no better example of keeping crime down than what happened in New York where, over nineteen years, the crime rate dropped 80 percent! Criminologists and urban planners have been at a loss to explain the dramatic drop in crime, but in his book The City that Became Safe: New York's Lessons for Urban Crime and Its Control, U.C. Berkeley's Franklin Zimring explains the tactics and techniques that have challenged long-held notions about law enforcement. My conversation with Franklin Zimring: