How does Superman fly and does he defy gravity?
superman is able to manipulate psionically,gravitaion particles, in an unknown and unconcious manner. to defy the forces of gravity.
at first he could only jump an eighth of a mile but do to his molecular structure and expsure to the yellow sun his ability to jump great distances turned into flight.
How come birds can defy gravity and humans cannot or is there a way to make us fly without an airplane?
Things that fly with wings are able to use the properties of the atmosphere to exert an upward force that's greater then the downward force of gravity. If there was no atmosphere birds and airplanes could not fly. Rockets are a different matter. They can fly without an atmosphere because they are able to spew out hot gas witch gives them an upward force greater then gravity.