I think I found a spelling mistake.w:Fraunhofer linesBAhrns15 (discuss • contribs) 18:52, 20 January 2016 (UTC)
I think you should ask a question about who Fraunhoffer and Kirchoff are and what they did in their lives. Ah2559 (discuss • contribs) 20:09, 26 January 2016 (UTC)Ah2559