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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.