Only humans shed emotional tears.
331
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Your fingernails grow faster in summer.
744
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
Poor eyesight (myopia) is associated with higher IQ.
232
On average a woman has 4 sexual partners in her lifetime.
-143
If the human eye was a digital camera, it would have 576 megapixels.
25
The human eye blinks an average of 4,200,000 times a year.
233