. . "Polish physicist" . . "Leopold Infeld"@en . . . . "1898-08-20Z"^^ . . . . . . . "Leopold Infeld (20 July 1898 \u2013 15 January 1968) was a Polish physicist who worked mainly in Poland and Canada (1938\u20131950). He was a Rockefeller fellow at Cambridge University (1933\u20131934) and a member of the Polish Academy of Sciences."@en . . . . "1968-01-15Z"^^ . "Infeld, Leopold"@en . . . . "1968Z"^^ . . . "1898Z"^^ . . . .