Amazing facts of human body you never heard

              Have you ever heard of these human facts of our body 

1) 75% of our body constitutes of water whereas our brain constitutes of 80%

2)our teeth starts growing before six months we born

3)everyone has a complete unique smell except twins

4)our height decreases in night to 1 cm compared to morning

5)50% of human DNA is same

6)In whole human body the only organ doesn't require blood supply is EYE

7)our body produces enough heat in only 30minutes  to boil  a half gallon of water

8)human bone is as strong as granite

9)by the age of 18 our brain stops growing

10)there are more than 600 individual skeletal muscles and 206 bones in our body