The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Your heart will pump about 212 million liters in its lifetime.
26
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69
It takes approximately 12 hours for food to entirely digest.
93
A man's beard grows fastest when he anticipates sex.
239
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191