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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.