The human brain is more active during sleep than during the day.
28
Yawns are more contagious among people with closer relationships.
163
The human body contains over a billion miles of DNA.
147
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
If the human eye was a digital camera, it would have 576 megapixels.
25
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456