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A file photo shows a crime scene blocked off by the Chicago Police Department. (WTTW News)

Crime overall is falling nationwide. But when it comes to homicides, Chicago’s numbers are not declining as quickly as the two largest cities in the nation — New York and Los Angeles.

(Brett_Hondow / Pixabay)

Northwestern sociology professor Andrew Papachristos has a striking idea when it comes to thinking about shootings in Chicago. He and local advocate Franklin Cosey-Gay tell us about their work with data and research.