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• Probably the most sweat-inducing user input verification code in history.

  This is the code in the Apollo Guidance Computer for Apollo 11. It’s part of the LUMINARY sofware, which ran on the AGC on the Lunar Module. It’s meant to check if the landing radar is pointed toward the lunar surface - because the LM went through several orientations, the landing radar could be pointed to the front or the side or down. You’re landing on the Moon. Point it down. Point is, you have to verify user input. Even if your users are the most meticulous and highly trained individuals...