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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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The human body produces and destroys 15 million blood cells every second.
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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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People about to have surgery must tell their health care providers about all supplements they take.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.