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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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Cyanide works by making the human body unable to use oxygen.
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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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Illicit drug use costs the United States approximately $181 billion every year.