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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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