Your fingernails grow faster in summer.
744
The human eye blinks an average of 4,200,000 times a year.
233
On average, there's 100 billion neurons in the human brain.
83
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Yawns are more contagious among people with closer relationships.
163
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The world's shortest man measures only 21.5 inches.
73