The question for this episode of the What If? series (previously at Neatorama) was, if there were a lake on the moon, what would it be like to swim in it? Well, there is no lake on the moon, but someday there might possibly be a swimming pool. It would have to be sheltered from the elements, or lack of, just like astronauts have to wear helmets. Safely inside a secured moon base, a pool would be a lot of fun. See, physics works the same on the moon, but the gravity is different from that on earth, leading to the kind of fun Randall Munroe is famous for.
Alas, real astronauts know better than to get their hopes up about a pool on the moon. The cost of transporting that much water would be, dare I say it, astronomical. Right now, we can't even manage to get our people back home from the ISS.
Go and look up Heinlein's book The Menace from Earth - He built the story about using light gravity and large sealed craters to FLY on the Moon! Very realistic and well thought-out.
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