Early American humans hunted car-size armadillos and used their shells for houses.
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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.
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On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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Tigers can see 6 times better at night than humans.
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It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
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The human eye blinks an average of 4,200,000 times a year.
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Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
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