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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.
The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
Illicit drug use costs the United States approximately $181 billion every year.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.