Grace Corrigan watched the Challenger lift off and explode with her daughter onboard. Christa McAuliffe was set to become the first teacher in space. All seven crew members died in the disaster 40 years ago. Corrigan, who died in 2018, told Lesley Stahl in 1996 she wasn't angry at NASA, but her husband, who died in 1990, felt differently. “[Christa McAuliffe] died because of NASA and its egos, marginal decisions, ignorance and irresponsibility. NASA betrayed seven fine people who deserved to live." #nasa #challenger #spacelaunch