1. Most of us have about 100,000 hairs on our scalp.

2. Each red blood cell travels round the body 172,000 times before it dies after about four months.

3. The fastest human muscle can make our eyelids blink at about five times a second.

4. More than half an adult person is water! For a man that’s about 40 litres enough to fill four pairs of large wellington boots.

5. The nails on the right handof a right  handed person grow faster than nails on the left hand , and vice versa.