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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 60,000 miles of blood vessels in every adult human.
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The longest a person has survived after a heart transplant is 24 years.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.