Enamel is hardest substance in the human body.
61
On average, there's 100 billion neurons in the human brain.
83
Only humans shed emotional tears.
331
Yawns are more contagious among people with closer relationships.
163
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
218
Gorillas can catch human colds and other illnesses.
205