Is Gravity Quantum

We'll discuss several experiments aimed at proving gravity is a quantum, not classical, field theory. Some of the experiments are more "thought experiments" than practical; others are aimed toward being practically feasible; others have already been done. The net effect of our arguments, I think (even without performing any of the not-yet-done experiments), is to make it clear gravity must be quantized, in the sense gravitational fields are made of "gravitons" obeying Planck's energy-quantization condition E=hf.