It takes about 20 seconds for a red blood cell to circle the whole body.
102
The human eye blinks an average of 4,200,000 times a year.
233
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
A person can live without food for about a month, but only about a week without water.
156
It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
218
Your thumb is about the same size as your nose.
124