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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 actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are more sensory neurons in the tongue than in any other part of the body.