Thanks Orac. A few years ago I was trying (in my low-tech, hitch-hiker way) to argue that causing and maintaining spacetime curvature must involve energy exchange. I was being shot down from all angles. It seems that a more devious approach can elicit quite different results. To be fair, I don’t remember if you were among the shooters, but I have my suspicions. smile

I just need to find a bit of time to digest your last couple of posts; I’ll be back.

BTW. A silly thought:

Gravity: that which keeps everyone down.
Grabity: that which lets the few rise above the masses.

There never was nothing.