Enamel is hardest substance in the human body.
61
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
On average, there's 100 billion neurons in the human brain.
83
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Obsessive nose picking is called Rhinotillexomania.
101
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266