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定居美国七年后,爱因斯坦于1940年宣誓效忠美国宪法,入籍美国。不过,他保留了瑞士国籍。之后不久,德国著名物理学家埃瓦德(1888—1985)来访。该埃瓦德并非等闲人物,他是索末菲学生,劳鹤好友,德国斯图加特理工高校校长。1933年他因为反对纳粹控制教育愤而辞职,1938年离开德国,这次到普林斯顿拜访爱因斯坦。老友重逢,相谈甚欢,兴尽分手,告辞时爱因斯坦托他带问德国的朋友们好,最后说:“请问候劳鹤。”埃瓦德顺口说:“也问候普朗克吧?”话音未落,爱因斯坦立刻重复道:“请问候劳鹤。”反应如此迅速,显非临时起意。很久之后埃瓦德在回忆文章中写道:“普朗
Seven years after settling in the United States, Einstein pledged allegiance to the United States Constitution in 1940 to become a naturalized U.S.. However, he retained Swiss citizenship. Shortly afterwards, the famous German physicist Ewald (1888-1985) visited. The Ewaard is not a casual character, he is a Sommerfeld student, a friend of cranes, Germany Stuttgart Polytechnic university principals. He resigned in 1933 for opposing the Nazi control of educational anger and left Germany in 1938, this time to visit Einstein in Princeton. Old friends reunited, talkative, happy to break up, to leave Einstein asked him to take good friends in Germany, and finally said: ”Please greet Laoshi. “ Ewart shouted: ”also greetings Planck right? “” Voice hardly ever, Einstein immediately repeat: “Please greet Laoshi.” “The reaction is so rapid, was not a temporary intent. Elvard wrote in a memoir long after: ”Prang