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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The horizontal fraction bar was introduced by the Arabs.
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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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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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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.