11.   On Thursday, Drs. Kenneth Begelman and Jeffrey Newman performed the first minimally invasive valve replacement in Palm Beach County at Delray Community Hospital.

12.   The car has had more valve replacements than Dick Cheney.

13.   Mission managers ordered a valve replacement on Saturday and aimed for a Tuesday launch.

14.   NASA ordered a valve replacement for space shuttle Endeavour on Saturday, further delaying its flight to the international space station.

15.   He thought Russian doctors were probably planning a valve replacement.

16.   Preferring to avoid risk, NASA decided Saturday to go ahead with the valve replacement.