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There are more bacteria in your mouth than there are people in the world.

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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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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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