Willem J. Luyten, photographer2018-09-212018-09-21circa 1920http://172.16.52.76:80/cdm/ref/collection/coll8/id/153https://hdl.handle.net/20.500.12111/1153Albert Einstein at the Leiden (Netherlands) home of physicist and mathematician Paul Ehrenfest, with Ehrenfest's son, Pavlik (Paul), sitting on Einstein's lap.B&WThis item is protected by copyright and/or related rights. However, for this item, either (a) no rights-holder(s) have been identified or (b) one or more rights-holder(s) have been identified but none have been located. Researchers are free to use this item in any way that is permitted by the copyright and related rights legislation that applies to their use. For more information, see https://rightsstatements.org/page/InC-RUU/1.0/?language=enEhrenfest, Paul, 1880-1933Einstein, Albert, 1879-1955Image