The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
The average person will go on a date at least 100 times before they finally marry.
33
Tigers can see 6 times better at night than humans.
305
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
A man's beard grows fastest when he anticipates sex.
239