Amazon CEO Jeff Bezos holds a Kindle e-book reader. The Kindle leads the market in sales of electronic readers. Ben Margot/AP hide caption

itoggle caption Ben Margot/AP

In 1951, Sugar Ray Robinson defeated Jake LaMotta in their sixth and final bout in 13 grueling rounds. Click here for a gallery of more photos of Robinson in action. AP hide caption

itoggle caption AP

Thelonious Monk relaxes with his wife, Nellie, before performing at the Royal Festival Hall in London on April 29, 1961. Erich Auerbach/Getty Images hide caption

itoggle caption Erich Auerbach/Getty Images