an essential element. Instead of tour guides, fifteen to twenty college students or secondary students, as well as some adults, were employed as "explainers". They demonstrate the exhibits and explain the principles involved all while circulating among visitors, rather than guiding them along. Oppenheimer strove to make learning a fun and enjoyable experience for all. Final years In 1977, Oppenheimer was diagnosed with lymphoma, and underwent two years of successful chemotherapy. Oppenheimer's first wife Jacquenette, died in 1980. In 1982, he married Mildred "Millie" Danielson. In 1983, lung cancer was discovered (he was a heavy smoker), and he underwent a lobectomy, in spite of which he continued to play the flute. Oppenheimer still remained active, appearing at the Exploratorium nearly daily until the last few weeks of his life. He died at home in Sausalito, California, on February 3, 1985. Legacy Frank Oppenheimer died in 1985, leaving his second wife Mildred Danielson, son Michael, and daughter Judith. Oppenheimer's papers and archives were transferred to the Bancroft Library at the University of California, Berkeley. Oppenheimer authored over 60 technical and nontechnical papers. The bulk of this collection covers his work in physics and education in the years leading up to his founding of the Exploratorium. Also included are papers related to his investigation by the House Un-American Activities Committee (HUAC). Historical archives of the Exploratorium (1957—present) are also kept at the Bancroft. The University of Minnesota holds archives covering Oppenheimer's physics work during 1946–1959. Oppenheimer considered the Exploratorium and its educational programs to be his most important accomplishment and legacy. A collection of selected Oppenheimer papers on science, art, and education is available online at the Exploratorium website. The Frank Oppenheimer Fellowship Fund was created at the Exploratorium to provide for the exchange of science museum personnel both nationally and internationally. In media Interviewed by director Jon Else, Frank Oppenheimer appears throughout The Day After Trinity (1980), an Academy Award-nominated documentary about J. Robert Oppenheimer and the building of the atomic bomb. Awards Distinguished Service Award, University of Colorado Distinguished Alumni Award, Caltech Guggenheim Fellowship 1965 Millikan Award, American Association of Physics Teachers (AAPT) 1973 Distinguished Service Award, American Association of Museums (AAM) 1982 Oersted Medal, American Association of Physics Teachers (AAPT) 1984 Kirkwood Award for Distinguished Service, Caltech See also Hybrid arts Science education Science museums References External links Oral history interview transcript with Frank Oppenheimer on 9 February 1973,