Roy Lewallen wrote:
...
Roy Lewallen, W7EL

Roy:

You remind me of a physics instructor of mine from 1970.

He brought in a very thick piece of foam rubber, a bowling ball and a
tennis ball. He placed the heavy bowling ball in the center of the foam
rubber; it sank, very pronouncedly, deep into the foam rubber. Next, he
placed the tennis ball some distance away, on the foam, from the bowling
ball; immediately the tennis ball rolled towards the bowling ball and
rested against it.

He then stated, "Gentlemen, that is an Einstein gravity well! Now we
will have a real look as to why."

chuckle
Regards,
JS