It takes about 20 seconds for a red blood cell to circle the whole body.
102
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
We share 70% of our DNA with a slug.
218
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human brain has the capacity to store everything that you experience.
4k
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The human body contains over a billion miles of DNA.
147
Poor eyesight (myopia) is associated with higher IQ.
232