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Vaccines prevent between 2.5 and 4 million deaths every year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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People about to have surgery must tell their health care providers about all supplements they take.