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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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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.