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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The human body produces and destroys 15 million blood cells every second.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.