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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
The FDA recognizes 118 routes of administration.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Illicit drug use costs the United States approximately $181 billion every year.
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