only one explanation why superman can fly (Score 2, Funny)

The man has a serious GAS problem, you can always see him lean his but out just a little before he takes off. Same thing goes when he levitate, it's just one constant steady flow of but wind. If a person were on krypton then they would be able to smell the difference, but on earth superman's gas emits no odor. The same theory can be applied to his super speed, i'm still working on the other abilities.