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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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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.
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The horizontal fraction bar was introduced by the Arabs.