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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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There are more sensory neurons in the tongue than in any other part of the body.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.