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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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Thyroid conditions may make getting pregnant impossible.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
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The horizontal fraction bar was introduced by the Arabs.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.