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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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There are approximately 3 million unintended pregnancies in the United States each year.
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Everyone has one nostril that is larger than the other.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.