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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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The horizontal fraction bar was introduced by the Arabs.