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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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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").