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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.