The human eye blinks an average of 4,200,000 times a year.
233
Poor eyesight (myopia) is associated with higher IQ.
232
Tigers can see 6 times better at night than humans.
305
Gorillas can catch human colds and other illnesses.
205
Your heart will pump about 212 million liters in its lifetime.
26
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13