Peyton Manning during the news conference Wednesday in Indianapolis when it was announced that he's leaving the NFL's Colts. Joey Foley/Getty Images hide caption

itoggle caption Joey Foley/Getty Images

Mariel Zagunis during a recent training session in Portland, Ore. Zagunis won gold medals in women's sabre fencing at the 2004 and 2008 Summer Olympics. Tom Goldman/NPR hide caption

itoggle caption Tom Goldman/NPR

Penn State head coach Joe Paterno stands with his team before they take the field during an NCAA college football game against the University of Wisconsin in State College, Pa., on Oct. 13, 2007. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP