The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
On average a woman has 4 sexual partners in her lifetime.
-143
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
A human being loses an average of 40 to 100 strands of hair a day.
133
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22