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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.