According to a 1950s survey, 75% of men ejaculate within two minutes of penetration.
109
Your heart rate can rise as much as 30% during a yawn.
69
If you are bitten by a poisonous snake, and fail to receive medical attention, you still have a 50% chance of survival.
28
The average female will have 3.3 pregnancies in her life.
49
The human brain doesn't stop developing until about 25 years old.
102
According to one report, it would take 800 marijuana joints to kill a person - but the cause of death would be carbon monoxide poisoning.
176
The average sperm cell swims at 8 inches per hour.
4
Enamel is hardest substance in the human body.
61