Strange quark
The first strange particle (a particle containing a strange quark) was discovered in 1947 (kaons), but the existence of the strange quark itself (and that of the up and down quarks) was only postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Way classification scheme of hadrons. The first evidence for the existence of quarks came in 1968, in deep inelastic scattering experiments at the Stanford Linear Accelerator Center. These experiments confirmed the existence of up and down quarks, and by extension, strange quarks, as they were required to explain the Eightfold Way.
Ralph A. James
Curium (atomic number 96) was discovered in 1944 by Glenn T. Seaborg, Ralph A. James and Albert Ghiorso during World War II in the Chicago Metallurgical Laboratory, as part of the Manhattan Project, by bombing plutonium with helium ions. It was named in honor of Pierre Curie and Marie Sklodowska Curie.