If you are of a certain age, you remember watching Apollo 11 land on the moon. Everyone in the world with access to TV was watching at the same time. Almost 50 years on, you might enjoy an explanation of how that happened. From the perspective of 2018, it seems like a miracle that we sent men to walk on the moon and brought them back to earth with less computer power than the average iPhone, when we now can't even hitch a ride to the space station.
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