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On average, the stomach produces 2 L of hydrochloric acid per day.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The average office desk has 400 times more bacteria on it than a toilet.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.