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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The horizontal fraction bar was introduced by the Arabs.