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Did you know?
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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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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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.
Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.