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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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Cyanide works by making the human body unable to use oxygen.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.