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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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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

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