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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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Tigers can see 6 times better at night than humans.
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Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
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