For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
One human hair can support 3 ounces.
191
On average, there's 100 billion neurons in the human brain.
83
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
In one day, adult lungs move about 10,000 litres of air.
11
You can't tickle yourself.
29
Enamel is hardest substance in the human body.
61