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Cyanide works by making the human body unable to use oxygen.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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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.