anti gravity

Was teslas anti gravity device a electromagnetic field kite or just high voltage flows of electrons? If you can harness the earths electromagnetic field for flight, then rotating EMFs at a fast speed on top a layer of stationary EMFs might give us a vortex of fast moving emf that creates lift...

Can it not be so that the dark matter we're looking for perhaps not even exist and the bindimg/repelling force might be space itself, since black holes collide and gravitational waves are generated, and the speed at which those waves travel can't surpass that of light, so it may be that those...