On January 28, 1986, Space Shuttle Challenger blew up 73 seconds into its flight during liftoff, killing all seven members of the crew. The entire sequence of events was carried live on television as a shocked nation watched the spacecraft explode and break apart in front of their eyes. 17 years later, Columbia had finished its mission and was returning to earth when it burned up and disintegrated during its return to Earth. The cause was a large hole in the left wing. In both cases the true source of the problem was organizational not mechanical. The failure of parts without negative consequences was so common in the space shuttle program, there was a name for it, "normalization of deviance."