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1. July 20, 1969, three minutes before lunar landing. Alarms blare in the Apollo 11 command module. Computer displays error codes: 1202, 1201. Buzz Aldrin reads them out. Mission Control goes silent. Nobody knows if they should abort. In Houston, a 24-year-old engineer recognizes the codes. The software is working exactly as designed. A woman in Massachusetts built the system that is about to save the mission. 2. Margaret Hamilton, 32, led the team that wrote Apollo's onboard flight software at
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