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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Cyanide works by making the human body unable to use oxygen.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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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.