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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.