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Why humans are like birds

The invention of high-strength synthetic materials will give rise, quite literally, to flying machines powered by human brawn.  There will also appear various hybrid aircraft powered by muscular and solar energy. People will fly not only by catching air currents as before with gliders, but also against the wind and for much greater distances.

I agree
28
I don't agree
9
SquishyMelon "brawn" don't you mean brain?
19 Jul 2021
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Rohith Calpakam Simple physics says no to flying machines powered by human brawn. It requires a TON of energy released at a short time to generate life. Bird get away with it because of their bone structure. Assuming we have ultra light materials, the size of the machine would be huge and no where enough for a human to power lift.
29 Jun 2019
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