The human eye blinks an average of 4,200,000 times a year.
233
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Pain occurs when sounds are above 130 db.
124
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Human hair and fingernails continue to grow after death.
7
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18