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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The average adult has about 21 square feet of skin.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.