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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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The human body produces and destroys 15 million blood cells every second.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.