Original: Kazimierz Fajans (Kasimir Fajans in many American publications; 1887 â "1975) was an American physical chemist of Polish origin and a pioneer in the science of radioactivity.
Simplified: Kazimierz Fajans (b. 27 May 1887 in Warsaw, Poland; d. 18 May 1975 in Ann Arbor, Michigan, USA) was an American physical chemist of Polish origin and a pioneer in the science of radioactivity.