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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.