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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Cyanide works by making the human body unable to use oxygen.
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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.