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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 horizontal fraction bar was introduced by the Arabs.
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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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.