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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.