Enamel is hardest substance in the human body.
61
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
There's 100 trillion good bacteria living in your body.
17
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
35,000 people in the U.S. will die from the flu annually.
6
In one day, adult lungs move about 10,000 litres of air.
11
You would need to smoke between 20,000-40,000 joints to be at risk of dying of a THC overdose.
12