The human brain doesn't stop developing until about 25 years old.
102
There are about 1,400 different species of bacteria in your belly button.
10
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The average person's skin weighs twice as much as their brain.
131
Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
The human body contains over a billion miles of DNA.
147
