Human body : Amazing Facts

1.The human bone is said to be as strong as granite.

2. In one square inch of human skin there are four yards of nerve fibres, 1,300 nerve cells, 100          sweat glands, 3 million cells, and 3 yards of blood vessels.

3. The digestive acids in the human stomach are strong enough to dissolve zinc. The cells in the stomach        lining are replaced quickly, with about 5,00,000 cells being replaced every minute, and the whole lining   every minute , and the whole lining every three days. So the stomach acids do not have time to dissolve the lining.