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There are more bacteria in your mouth than there are people in the world.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Cyanide works by making the human body unable to use oxygen.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.