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Don Eyles: Space Hacker - IEEE Spectrum

In the early hours of 5 February 1971, Don Eyles had a big problem: Apollo 14 astronauts Alan Shepard and Edgar Mitchell were orbiting the moon, preparing to land, but it looked like they were going to have to come home without putting so much as a single footprint on the surface. The only way to save the mission was for Eyles to hack his own software.