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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 sensory neurons in the tongue than in any other part of the body.
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The horizontal fraction bar was introduced by the Arabs.
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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.