QUOTE (Billy of the Hill @ Dec 14 2007, 02:07 AM)

Isn't the science behind these mashal-art acts- that Bone is like Honeycomb..?
So, if you keep hitting it, over time..the honeycomb like structure is squashed down until it's as hard as stone.

That's exactly right yes.
The martial art i attended, we had to roll these sticks over our shinbones all the time, to harden the bone slowly. Several years later you can break a baseballbat with your shinbone and hardly feel it.
We also had to run around outside in the snow, barefoot, bleeding from cuts and cold as hell. If you're persistant you can regulate when you want to recieve "pain signals" from the brain.