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Did you know?
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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%