Is it possible for a human to be genetically altered to be able to fly, but instead of wings, they use internal cavities filled with a lighter-than-air gas (possibly hydrogen) which, paired with hollow bones and reduced weight, enables them to fly simply by flapping their arms? I don’t mean that they’re actually floating up and up, but just light enough that they can fly like a balloon with wings.
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A human has an internal volume of about 70 liters. If all the internal volume of a human was filled with hydrogen, that would provide a lifting force of about 70 grams or 2 ½ ounces. – AlexP Oct 20 '22 at 13:45
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D’oh! Bugger it! – user98816 Oct 20 '22 at 14:02