Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Human hair and fingernails continue to grow after death.
7
We share 70% of our DNA with a slug.
218
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
If your DNA was stretched out it would reach to the moon 6,000 times.
256
The human brain is more active during sleep than during the day.
28
You can't tickle yourself.
29
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13