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Author Question: A baseball player is asked to swing at pitches in sets of four. The player swings at 100 sets of 4 ... (Read 68 times) |
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.
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.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.