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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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The horizontal fraction bar was introduced by the Arabs.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.