When you take a step, you are using up to 200 muscles.
Largest and smallest cells in human
The largest cell in the human body is the female egg and the smallest is the male sperm.
More Humans Facts
When you take a step
Speed of a Sperm Cell
The average sperm cell swims at 8 inches per hour.
Penetration Period Fact
According to a 1950s survey, 75% of men ejaculate within two minutes of penetration.