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Your heart beats over 36 million times a year.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Thyroid conditions may make getting pregnant impossible.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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