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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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The average adult has about 21 square feet of skin.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.