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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.