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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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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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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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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.