![](http://www.alamy.com/thumbs/6/ACF31173-C400-417C-9BE9-39386F3D6AB8/P720CW.jpg)
en:Niels Bohr and en:Albert Einstein Foto by Paul Ehrenfest (1880-1933). The picture was taken at Ehrenfest's home in Leiden, the occasion was most likely the 50th anniversary of Hendrik Lorentz' doctorate (December 11, 1925) . 170 Niels Bohr Albert Einstein3 by Ehrenfest
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Photo credit: © The Picture Art Collection / Alamy / Afripics
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