"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
I don't know who first thought of powering an aircraft with solar energy alone; as far as I know, working models didn't appear until the 1970's. So, this is a fairly early mention of the idea.
The brothers Albert and Gaston Tissandier developed the first electrically propelled dirigible, first flown in 1883.
(Image: Library of Congress)
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