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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.