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  2. 2013 in science - Wikipedia

    en.wikipedia.org/wiki/2013_in_science

    A related special issue of the journal Science, published earlier, described the discovery of the exoplanets. 10 May An annular solar eclipse occurs. The concentration of carbon dioxide (CO 2) in Earth's atmosphere reaches a symbolic milestone, passing 400 ppm (parts per million) for the first time in human history.