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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.