NASA still stumped by shuttle fuel gauge

CAPE CANAVERAL, Fla. -- Nearly a week after a faulty fuel-gauge reading halted the first shuttle countdown since the Columbia tragedy, NASA had yet to uncover any clues to the problem Monday and put off the flight of Discovery until at least next week. "Right now, I can tell you that we're still looking for the problem," shuttle program manager Bill Parsons said at an evening news conference. "We've waited two-plus years, 2 1/2 years to be here. We're trying awfully hard to resolve this issue." Discovery -- indefinitely grounded since Wednesday's fuel gauge failure -- will fly no earlier than next Tuesday.