The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Only humans shed emotional tears.
331
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
A human being loses an average of 40 to 100 strands of hair a day.
133
On average a woman has 4 sexual partners in her lifetime.
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Babies crawl an average of 200m a day.
212