"Everyone knows the story of the murder of young Emmett Till. In August 1955, the fourteen-year-old Chicago boy was murdered in Mississippi for having--supposedly--flirted with a white woman named Carolyn Bryant, who was working behind the counter of a store. Emmett was taken from the home of a relative later that night by white men; three days later, his naked body was recovered in the Tallahatchie River, weighed down by a cotton-gin fan. Till's...