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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.