Nadine Gordimer passed away this week at age 90, after a lifetime of achievement in writing and anti-apartheid activism. Radu Sigheti/Reuters /Landov hide caption

itoggle caption Radu Sigheti/Reuters /Landov

On June 6, 1944, U.S. assault troops landed on Omaha Beach during the invasion of Normandy. What might be different today if they had been turned back? Keystone/Getty Images hide caption

itoggle caption Keystone/Getty Images