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
There are about 255 babies born worldwide every minute.
46
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A person can live without food for about a month, but only about a week without water.
156
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
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
In one day, adult lungs move about 10,000 litres of air.
11