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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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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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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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The horizontal fraction bar was introduced by the Arabs.