Hour 25 was a radio program focusing on science fiction, fantasy, and science. It was broadcast weekly on Pacifica radio station KPFK in Southern California from 1972 to 2000. In its heyday, Hour 25 featured numerous interviews with famous authors of science fiction and fantasy, in addition to luminaries of the scientific community. On its archival website, there is an extensive archive of older shows featuring interviews with popular authors, including Terry Pratchett, Larry Niven, Laurie R. King, Frank Kelly Freas, and Neil Gaiman.