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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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.