NASA delays space shuttle launch a fourth time

NASA delayed the launch of space shuttle Discovery for a fourth time on Friday amid valve concerns, and managers are uncertain when the flight will take place.

Following a 13-hour meeting at Kennedy Space Center, shuttle managers decided against launching next week. The launch had been targeted for no sooner than Feb. 27; no new date was set.

More information:
http://www.google.com/hostednews/ap/article/ALeqM5h1W8dcUP9H70AmlSfDSenPteDT9gD96FOM0O0