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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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The horizontal fraction bar was introduced by the Arabs.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.