Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The average person's skin weighs twice as much as their brain.
131
Your fingernails grow faster in summer.
744
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
In one day, adult lungs move about 10,000 litres of air.
11
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Only humans shed emotional tears.
331