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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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Everyone has one nostril that is larger than the other.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.