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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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Medication errors are three times higher among children and infants than with adults.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.