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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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 average adult has about 21 square feet of skin.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.