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People had write the computer programs that operated the rocket that let astronauts land on the moon in 1969. A team of around 100 computer programmers had to write code that had to be very reliable (you don't want to find out your rocket has a bug when you're half-way to the moon). The computer programs also had to be as small as possible so that they would fit on the hardware. This is because the computer memory on the rocket was millions of times smaller than the memory in modern mobile phones.
Photo from this article about the team leader, Margaret Hamilton.