Becky Breckenridge sells t-shirts in Titusville, Fla., as she and thousands wait for the launch of Space Shuttle Endeavour at the Kennedy Space Center at Cape Canaveral, Friday, April 29, 2011. NASA ... more 
Becky Breckenridge sells t-shirts in Titusville, Fla., as she and thousands wait for the launch of Space Shuttle Endeavour at the Kennedy Space Center at Cape Canaveral, Friday, April 29, 2011. NASA has called off Friday's launch because of a technical problem. less 
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Associated Press | Photo By J Pat Carter
Fri, Apr 29, 2011 12:37 PM EDT