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Illicit drug use costs the United States approximately $181 billion every year.
There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The horizontal fraction bar was introduced by the Arabs.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.