The "skeptic" community prides itself on believing only what there is proof or evidence for. But I have yet to see the proof that there is a force called gravity pulling everything to the center of the earth. As I sit at this computer, gravity ought to be pulling me deep into the bowels of the earth, and yet I am still sitting here. Why do scientists believe that gravity exists? Why do they think that a shoe hovering in midair is any less likely than a shoe hovering on the floor? Can you give me proof that objects must fall when dropped, even if started out motionless?