998
The fool should learn to fly.
(lemmy.world)
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I think you underestimate our past ignorance. It took many decades of science being taught for the general population to "know" that air exists.
I think the general population always knew that there was a transparent substance all around them which had to keep going in and out of their lungs or they would die - the "breath of life" from the Bible. I mean, even an uneducated peasant in ancient times could blow bubbles underwater and see that there was something coming out of his mouth.