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The longest a person has survived after a heart transplant is 24 years.
There are more sensory neurons in the tongue than in any other part of the body.
There are more bacteria in your mouth than there are people in the world.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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