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Did you know?
The horizontal fraction bar was introduced by the Arabs.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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There are 20 feet of blood vessels in each square inch of human skin.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The familiar sounds of your heart are made by the heart's valves as they open and close.