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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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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.