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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Early American humans hunted car-size armadillos and used their shells for houses.
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By weight, Bone is five times stronger than steel.
417
It has been scientifically proven that stroking a cat can lower one's blood pressure!
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Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
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After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
A person can live without food for about a month, but only about a week without water.
156
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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