NASA ADMINISTRATOR O'KEEFE AT A BRIEFING ON THE SHUTTLE COLUMBIA, 2003-02-10 (photo)

NASA administrator Sean O'Keefe (C) ponders a question during a briefing at the NASA building in Washington February 10, 2003 as William Readdy, deputy associate administrator in the office of space flight (L) and Michael Kostelnik, NASA deputy associate administrator for the Space Shuttle and International Space Station program looks on. Over 12,000 items thought to be from the space shuttle Columbia have been found since it disintegrated over several western states on February 1 as NASA officials try to piece together what happened. REUTERS/Jason Reed JIR/ME