A Not-So-Simple Truth, Wayne Hale
"February is a month for introspection for me, and the events of 8 years ago have been on my mind. In the Columbia accident investigation report, there are several pages devoted to the use of a computer program called "Crater" which analyzed potential damage to the thermal tiles. The results provided from that computer program indicated that no serious damage had been done to Columbia's tiles and therefore a safe landing would occur. Disaster occurred instead."