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
It takes approximately 12 hours for food to entirely digest.
93
The human brain is more active during sleep than during the day.
28
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
On average a woman has 4 sexual partners in her lifetime.
-143
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Babies crawl an average of 200m a day.
212