Klaus Fuchs, German physicist, politician, and atomic spy (born 1911)

Klaus Emil Julius Fuchs was a theoretical physicist, atomic spy, and communist who supplied information from the American, British, and Canadian Manhattan Project to the Soviet Union during and shortly after World War II. While at the Los Alamos Laboratory, Fuchs was responsible for many significant theoretical calculations relating to the first nuclear weapons and, later, early models of the hydrogen bomb. After his conviction in 1950, he served nine years in prison in the United Kingdom, then migrated to East Germany where he resumed his career as a physicist and scientific leader.

January 28 is the 28th day of the year in the Gregorian calendar; 337 days remain until the end of the year.