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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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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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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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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.