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Did you know?
Your heart beats over 36 million times a year.
Did you know?
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Did you know?
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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The familiar sounds of your heart are made by the heart's valves as they open and close.