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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Thyroid conditions may make getting pregnant impossible.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.