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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Cyanide works by making the human body unable to use oxygen.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The horizontal fraction bar was introduced by the Arabs.