Chi Wei

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In the meantime, from particle physicists:

Joao Magueijo "...gravity emanates from everything, be it heat, light, magnetic fields, even gravity itself. It is the last feature that makes the mathematics of relativity so complicated: it describes matter producing gravity and then gravity itself as the source for more gravity in an intricate cascade."

Einstein could not define gravity and spent his life trying, in fact died trying. It is a power that keeps us from floating into space, that keeps the atoms together, that keeps our Earth from drifting away from the sun, is inexplicable. The reason for this is that it is next to nothing, and nothing is impossible to define.

Magueijo continues concerning Einstein's confusion: "He thus restored nothingness to the nothing (as he dispensed with the ages old "ether" theory), voidness to the void. And then (in 1917) he was
reversing himself completely, asking whether one could ascribe some sort of existence to the void after all, so that the void could produce gravity. Could nothing be something?"

The late Richard Feynman:

"The theory of gravitation... was not understandable from the laws of motion... gravitation
is, so far, not understandable in terms of other phenomenon... So not only have we no experiments with which to check a quantum theory of gravitation, we also have no reasonable theory."