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Did you know?
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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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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Your heart beats over 36 million times a year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.