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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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