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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.