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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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Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The familiar sounds of your heart are made by the heart's valves as they open and close.