I'm holding a small stack of paper, 10 maps of the city, each marked with a different red box, representing today's 10 hot spots. They are surprisingly small, just 500 feet by 500 feet. Above each map is a set of statistics: the probability that a crime will take place in that area today, the two hourlong windows when that potential crime is most likely to occur, and the likelihood that the crime will be a home break-in or an auto theft ("burgs," Clark calls them). I flip through the stack until I find Linden Street, where, the statistics reveal, there is a 2.06 percent chance of a crime happening today, and 3:1 odds that a crime, should it occur, will be a home break-in versus an auto theft. "These are the high-probability windows," Clark says, pointing to two times above the map, 7 a.m. and noon.