A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Enamel is hardest substance in the human body.
61
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The world's shortest man measures only 21.5 inches.
73
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62