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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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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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Everyone has one nostril that is larger than the other.

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The horizontal fraction bar was introduced by the Arabs.

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The average adult has about 21 square feet of skin.

Dred Scott and his wife and children are featured on the cover of Frank Leslie’s Illustrated Newspap Dred Scott and his wife and children are featured on the cover of Frank Leslie’s Illustrated Newspap
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Video: Rena arc construction

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