and once they get in there and do that, then they'll be able to determine exactly how long of a delay. i had heard from some folks that it's probably no earlier than a 48-hour delay, unless somehow or other they find that it's something very simple. but it is not, from what i understand, an easy fix. so, the astronauts will go back and they'll just go back to the operations and checkout building, and they will wait to see how long a delay this is. if it stretches out beyond a few days, then obviously, they would go ahead and return back to houston until the shuttle is ready to fly. but again, they're not going to be able to do anything until they actually drain that tank, and that takes several hours to do that, before they can actually get in there, the trouble-shooters, to see what exactly the problem is with these two heaters on apu-1. and again, there's three apus, but one of them, there are malfunctioning heaters, and that has forced the scrub of today's "endeavour" launch. >> and john, this is more of a complicated situation because you had literally the president