Why Are There So Many Gang Members in Chicago?

Out of all major U.S. cities, only Los Angeles compares to Chicago in the number of gang members—and Chicago may well have more than the nation’s second-largest city. It has considerably more than New York. What went wrong, and what can be done to address it?

The Paths of Chicago Twitterers

A map of Chicago using geotagged tweets shows the corridors of travel from one point to another, based on who’s tweeting from where. It mostly looks like you’d expect, with one mystery.