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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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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.
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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.