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There are 20 feet of blood vessels in each square inch of human skin.
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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.