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W Heisenberg and Niels Bohr, Wikimedia Commons, Werner Heisenberg and Niels Bohr (similar photo) https://commons.wikimedia.org/wiki/File:Heisenbergbohr.jpg Wikimedia Commons, Werner Heisenberg and Niels Bohr (similar photo, coloured) https://commons.wikimedia.org/wiki/File:Niels_Bohr_and_Werner_Heisenberg,_a_German_physicist.jpg
