Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Your thumb is about the same size as your nose.
124
The human brain is more active during sleep than during the day.
28
Only humans shed emotional tears.
331
The human sigh acts as a physiological reset button.
23
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Research has determined that most people are happiest at 7:26pm on a Saturday night.
70