Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Everyone has one nostril that is larger than the other.
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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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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
