The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Selected skeletal muscles and the Achilles tendon (anterior and posterior views).
Selected Antiemetics
Selected Minerals for Treating Nutritional and Electrolyte Disorders
Selected Members of the Classes of Neurotransmitters
Productivity in Selected Industries in the Early 1990s
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