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1 (of 1) Svante Arrhenius and the Boltzmann group in Graz, 1887. Back row: Walther Nernst (awarded the 1920 Nobel Prize in Chemistry), Heinrich Streintz, Svante Arrhenius, Richard Hiecke. Front row: Eduard Aulinger, Albert von Ettingshausen, Austrian physicist Ludwig Boltzmann, Ignaz Klemenčič and Victor Hausmanninger.

Source: Universität Graz. Public domain via Wikimedia Commons. Photographer unknown.