Weird medieval fantasy foresees oxygen tanks, extreme mountaineering, space travel.


“Mount Olympus riseth even to the clear aether, wherefore letters written in the dust on the summit of that mountain have been found unchanged after the lapse of a whole year. Neither do birds live there, by reason of the rarefaction of the air, nor could the philosophers who have ascended it remain, even for a brief space of time, without sponges soaked in water, which they applied to their nostrils and sucked thence a denser air.”
Anon., 11th century

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