It takes about 20 seconds for a red blood cell to circle the whole body.
102
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
By weight, Bone is five times stronger than steel.
417
Enamel is hardest substance in the human body.
61
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
Mushrooms are more closely related to humans than they are to plants.
47