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
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Poor eyesight (myopia) is associated with higher IQ.
232
A man's beard grows fastest when he anticipates sex.
239
Tigers can see 6 times better at night than humans.
305
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191