Apollo 12 astronauts returned from the moon so filthy that their pilot made them strip before entering his spacecraft; dust stayed under their nails for weeks

During the Apollo 12 mission, commander Richard Gordon mandated that his crew strip down to their bare essentials before entering the command module. This drastic step was prompted by the stubborn lunar dust that coated their suits post-moonwalk. The fine, gray powder was not only hard to remove but also posed ongoing issues, irritating the crew and clogging vital filters on their return trip.
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