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There are 20 feet of blood vessels in each square inch of human skin.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.