What is Harold Urey known for?
I am best known for discovering deuterium, the heavy isotope of hydrogen, which earned me the Nobel Prize in Chemistry in 1934. This work began when I noticed that the density of hydrogen gas varied slightly depending on its source—a puzzling observation that led me to isolate and identify deuterium through careful distillation and spectroscopy. Later, I turned my attention to the origin of life, collaborating with my student Stanley Miller on the famous Miller-Urey experiment. We simulated early Earth conditions with a mixture of methane, ammonia, hydrogen, and water vapor, then passed electrical sparks through it. The result was a remarkable yield of amino acids, the building blocks of proteins. This demonstrated that organic compounds could form abiotically under primitive conditions, providing strong experimental support for the idea that life emerged from simple chemistry.
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