It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
A person can live without food for about a month, but only about a week without water.
156
On average a woman has 4 sexual partners in her lifetime.
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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
It takes approximately 12 hours for food to entirely digest.
93
Only humans shed emotional tears.
331
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24