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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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There are approximately 3 million unintended pregnancies in the United States each year.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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