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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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There are 20 feet of blood vessels in each square inch of human skin.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
Relationships between biomass variation and species diversity.
Male Skeleton
Sexual swellings are one way for females to advertise their mating availability, thereby inducing ma