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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 ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Vaccines prevent between 2.5 and 4 million deaths every year.