The human brain doesn't stop developing until about 25 years old.
102
There's 100 trillion good bacteria living in your body.
17
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
There are about 1,400 different species of bacteria in your belly button.
10
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
In Ancient Greece, small penises were desirable, and big ones were for ‘old men and barbarians’
22
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89