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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Your heart beats over 36 million times a year.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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