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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
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Everyone has one nostril that is larger than the other.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.