The meanest streets of Kent are to be found in little pink boxes. Or at least they are if you look at them through the crime-prediction software produced by an American company called PredPol. Places in the county east of London where a crime is likely on a given day show up on PredPol's maps highlighted by pink squares 150 metres on a side. The predictions can be eerily good, according to Mark Johnson, a police analyst: "“In the first box I visited we found a carving knife just lying in the road." PredPol is one of a range of tools using better data, more finely crunched, to predict crime....

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