text: do people care to know what makes the stick to the ground? is gravity theory neccessary to understand why we are able to walk on the earth and not float ? do people care to proof-read their questions before they submit them?  gravity is not a 'theory', it is a proven fact - it aint magic keeping you on the ground.  what's to understand? the earth's mass creates gravity, which keeps us 'grounded'. easy. done.