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The horizontal fraction bar was introduced by the Arabs.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.