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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).