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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 longest a person has survived after a heart transplant is 24 years.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.