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The horizontal fraction bar was introduced by the Arabs.
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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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Medication errors are three times higher among children and infants than with adults.
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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
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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.