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The amazing Saturn V guidance system explained by a retired IBM engineer who worked on its design.
youtube.com/watch?v=dI-JW2UIAG

There's a longer video with more details on the inertial control, the liquid cooling system, and a little thing I didn't know: some of the third stages of the Saturn V were crashed into the moon to cause a small shock wave that would be picked up by seismographers installed by previous Apollo missions to determine whether the moon had a liquid core 😮

youtube.com/watch?v=6mMK6iSZsA

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