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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Your heart beats over 36 million times a year.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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.