It takes about 20 seconds for a red blood cell to circle the whole body.
102
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
In one day, adult lungs move about 10,000 litres of air.
11
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
Enamel is hardest substance in the human body.
61
By weight, Bone is five times stronger than steel.
417
You can't tickle yourself.
29
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127