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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.