@CanberraOmega Not sure about this one. I think manned capsules are/were climate controlled, so wouldn't be zero humidity. And the time they spent in the vacuum of space was very limited.
But back to earth, I'm talking about prolonged and close proximity to some agent like silica gel that is (I suppose) actively sucking moisture out of the air (?) Not sure if that creates a zero-humidity environment or what it does ...or (to the heart of the question) if what it does could be harmful over a long period of time, and if so, exactly how long a period.
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