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EinsteinEhrenfestKamerlinghOnnesWeiss. Albert Einstein Paul Ehrenfest Paul Langevin Heike Kamerlingh Onnes and Pierre Weiss at Onnes's home in Leiden the Netherlands cstrasbourg fr htm Photo by Paul Ehrenfest's designee PDold Albert Einstein Paul Ehrenfest Paul Langevin Heike Kamerlingh Onnes Pierre Weiss Black and white