RT @DrMRFrancis: Ooh! RT @KarenLMasters: Emission…

November 19th, 2014 by Ciarán Leave a reply »

RT @DrMRFrancis: Ooh! RT @KarenLMasters: Emission spectra of the elements (facebook.com/ScienceAlert/p…) via @aallan http://t.co/8DzHqS27nK

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