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In 1864, the first barbiturate (barbituric acid) was synthesized.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.



