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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average adult has about 21 square feet of skin.
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Medication errors are three times higher among children and infants than with adults.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.