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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.