Mission Specialists, Scott Parazynski, Paolo Nespoli, of Italy, and Dan Tani, from left, wave as they leave the Operations and Checkout Building with their fellow crew mates early Tuesday Oct. 23, 2007, for a trip to the launch pad and a planned liftoff onboard the Space shuttle Discovery at the Kennedy Space Center in Cape Canaveral, Fla. Credit: AP/Chris O'Meara
