NASA repairs shuttle problem, sets May 16 launch

CAPE CANAVERAL, Fla. - NASA on Monday cleared space shuttle Endeavour for a second launch attempt on May 16 to deliver a pioneering physics experiment and spare parts to the International Space Station.
NASA was nearly four hours away from launching Endeavour on its 25th and final mission on April 29 when a heater in an onboard power system failed, prompting managers to stop the countdown.