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The horizontal fraction bar was introduced by the Arabs.
In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
There are approximately 3 million unintended pregnancies in the United States each year.
The average adult has about 21 square feet of skin.
Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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