In 1952, chemists Harold Urey and Stanley Miller mixed ammonia, methane, and hydrogen; in a closed container; zapped it with electrical sparks and found that:

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Urey and Miller's experiment produced many of the amino acids contained in DNA, suggesting that these basic building blocks of life could have formed under the conditions of early Earth. However, they did not create life in a test tube or induce cold fusion to occur, and there is no evidence that single-celled microorganisms were spontaneously created. While they did not create any complete proteins or living organisms, their experiment provided important insights into the origins of life on Earth.

In 1952, Chemists Harold Urey and Stanley Miller Mixed Ammonia