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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.