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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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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.
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There are more sensory neurons in the tongue than in any other part of the body.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.