Seriously. How do they fly?
It's not because Krypton had more gravity. That doesn't make a lick of sense.
I've heard the telekinetic theory, and it seems to fit best. You know, how Kryptonians develop minimal telekinetic powers that enables them to fly and lift objects without breaking them (for example,Supes could lift a plane from the wing, even though in real life, the wing would snap off.)
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Why does he have Heat vision and the ability to see in various visions? Every power that isn't just an enhanced human ability makes no sense, but oh well, he's a superhero.