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In 1864, the first barbiturate (barbituric acid) was synthesized.

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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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Video: Integumentary Anatomy

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