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Did you know?

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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On average, the stomach produces 2 L of hydrochloric acid per day.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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Your heart beats over 36 million times a year.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

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