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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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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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The horizontal fraction bar was introduced by the Arabs.
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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.