In 1864, the first barbiturate (barbituric acid) was synthesized.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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The average adult has about 21 square feet of skin.
Boundaries within landscapes created by human activity (background) and natural environmental gradie
Range of Motion of the Spine, Flexion and Hyperextension
Measuring Brain Activity
Termination of norepinephrine activity through enzyme activity in the synapse.
Share of Hours Worked by Education Level, 1940–2008