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Scientists know roughly when it started but are still working on how
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What, no mention of the Urey-Miller experiment which conclusively demonstrated that organic compounds could spontaneously arise from a warm mix of certain simple chemicals sparked by electricity?
http://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment
While Urey-Miller is important, newer experiments have found that RNA forms even easier than that.
No electricity needed, starting with even simpler chemicals than U-M started with; just a "drying out" phase made all the difference.
http://www.wired.com/wiredscience/2009/05/ribonucleotides/
Nice info.