A human being loses an average of 40 to 100 strands of hair a day.
133
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
You can't tickle yourself.
29
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The average sperm cell swims at 8 inches per hour.
4