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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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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.