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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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The average adult has about 21 square feet of skin.
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The familiar sounds of your heart are made by the heart's valves as they open and close.