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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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The horizontal fraction bar was introduced by the Arabs.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.