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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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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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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.