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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.