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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.