On May 27, 1963, Ali (known then as Cassius Clay) held up five fingers in a prediction of how many rounds it would take him to win against British boxer Henry Cooper. In June 1963, he fulfilled his prediction and was declared the bout winner after five rounds.
Kent Gavin/Getty Images
A U.S. Marine from the 1st Battalion, 8th Marines, Alpha Company looks out as an evening storm gathers above an outpost near Kunjak, in southern Afghanistan's Helmand province.
Ted Kaczynski is flanked by federal agents as he is led from the federal courthouse in Helena, Mont., on April 4, 1996. Kaczynski is now serving a life sentence in prison for the bombings.
John Youngbear/Associated Press
Author Michael Wallis says there are modern lessons to learn from the Donner Party — primarily about the fatal combination of ignorance and arrogance. Above, an undated drawing of the pioneers, looking to make their way West.
Bettmann Archive/Getty Images
A polling station in Oakmont, Pa., on Nov. 6, 2012. Winning a presidential nomination includes mastering complex rules about delegates, and Pennsylvania's rules are among the most complicated.
Jeff Swensen/Getty Images