Key Emmett Till witness gave false testimony, historian says

NEW YORK - The woman at the center of the trial of Emmett Till's alleged killers has acknowledged that she falsely testified he made physical and verbal threats, according to a new book.Author Timothy Tyson told The Associated Press on Saturday that Carolyn Donham broke her long public silence in an interview with him in 2008. His book, "The Blood of Emmett Till," comes out next week.Emmett Till was a 14-year-old black teenager tortured and killed in 1955 in Mississippi for allegedly whistling a