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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.