Before walking on the moon, future astronauts may go for a swim. The famed Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center in Houston has trained hundreds of spacewalkers since 1992 ...

I swallowed down desperate gulps of air from my snorkel. Pool water, too. My lungs burned. The water sloshed around me in waves, churning so much it looked like a boiling sea, the phenomenon natural ...

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