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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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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.