The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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 human brain has the capacity to store everything that you experience.
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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.
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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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There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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