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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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There are more bacteria in your mouth than there are people in the world.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.