A guy told me this theory which will counter act gravity and here is an explanation to destroy his theory: You are on a satellite orbiting the earth at high speeds using centripetal force (acceleration) to overcome gravity (same characteristics as acceleration). Now, relative to the satellite (you can't have an accelerated frame of reference, like a satellite, for relativity but I'll get to that later) you are looking down and it just looks like the earth is rotating at a certain speed, it could even look still if the satellite is moving in the same direction as the earths rotation. That is the scenario and from that base, there are a few things to understand. First off, the entire scenario is theoretically possible though you can't take a frame of reference because everything is spinning, thus constantly changing direction, hence accelerating, therefore It would be an accelerated frame of reference, in which case using relativity would defy the laws of physics. So, this guy said something like: now imagine you have the earth and the satellite, and you are looking at both of them from thousands of miles away. You are RELATIVE TO THE SATELLITE (we discussed that earlier) so the satellite "isn't moving". Now, you reach out your arm (something like a 2,000 mile long arm) and you spin the earth faster. The faster the earth spins, the lesser the gravity, because you are making more centripetal force and overcoming gravity (acting as the "centriFUGAL" force). At the time, I didn't know what to say to him so I thought about it for a few days and the more i thought about it, the more it made sense. After I thought for a good long time I remembered YOU CAN'T HAVE AN ACCELERATED FRAME OF REFERENCE. And now I feel stupid for not realizing that sooner.