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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One human hair can support 3 ounces.
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You can't tickle yourself.
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After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
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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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The world's shortest man measures only 21.5 inches.
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Our brains have a negativity bias and will remember bad memories more than good ones.
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We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
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