Rain, overcast sky delay space shuttle's return  CAPE CANAVERAL,
Fla. (AP) - Rain and overcast skies prevented space shuttle
Discovery from returning to Earth on Monday, and Mission Control
instructed the astronauts to spend a 15th day circling the world
and awaiting better weather.  Mission Control radioed up the
disappointing news after passing up two landing attempts.  "The
folks really worked it hard down here. There was a lot of cause
for optimism ... but in the end of the day" the clouds remained
too low and too thick, Mission Control radioed.  "We appreciate
everything you've done," replied shuttle commander Alan
Poindexter, "and we'll be hopeful for better weather tomorrow."
He urged flight controllers to get some rest.  Clearer skies are
expected over Kennedy Space Center on Tuesday. If the clouds
linger, however, NASA will try for the backup landing site in
Southern California. The first landing opportunity is at 7:34
a.m., shortly after sunrise in Florida.  Discovery and its seven
astronauts can re