Enamel is hardest substance in the human body.
61
The human brain doesn't stop developing until about 25 years old.
102
The human sigh acts as a physiological reset button.
23
The average sperm cell swims at 8 inches per hour.
76
When you take a step, you are using up to 200 muscles.
886
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24