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There are 20 feet of blood vessels in each square inch of human skin.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.