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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.