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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Medication errors are three times higher among children and infants than with adults.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.