Space shuttle Endeavour astronauts (L-R) Dave Williams of the Canadian Space Agency, Rick Mastracchio, Tracy Caldwell, Alvin Drew Jr., Commander Scott Kelly and Pilot Charles Hobaugh pose on the tarmac after returning to the Kennedy Space Center in Cape Canaveral, Florida August 21, 2007. Crewmember Barbara Morgan was not feeling well and did not join the others on the runway. Endeavour completes Mission STS-118 to the International Space Station. [Reuters]