The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
You forget 90% of your dreams.
256
The human body contains over a billion miles of DNA.
147
The average person will go on a date at least 100 times before they finally marry.
33
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
You can't tickle yourself.
29
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
We share 70% of our DNA with a slug.
218