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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 bacteria in your mouth than there are people in the world.
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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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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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There are more nerve cells in one human brain than there are stars in the Milky Way.