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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.