The Sourcebooks are the “Encyclopedia Britannica” of the unexplained. For over 13 years, physicist and science writer William R. Corliss has systematically searched the pages of a century’s backlog of scientific journals, extracting every report of the bizarre or inexplicable in an exhaustive effort to “catalog what is not known.” His ever-expanding database currently encompasses over 30,000 items, some of which he’s managed to catalog in his 13-volume Sourcebook series; over 20 more volumes are planned. The volumes bear titles like Rare Halos, Mirages, Anomalous Rainbows, and Related Electromagnetic Phenomena; Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena; and The Sun and Solar System Debris. The