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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.