Only humans shed emotional tears.
331
A man's beard grows fastest when he anticipates sex.
239
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The human brain uses approximately as much energy as a 10 watt light bulb.
120
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
Pain occurs when sounds are above 130 db.
123
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197