Famous First Facts is a book listing "First Happenings, Discoveries and Inventions in the United States". The current version of the book — the sixth edition (ISBN 0-8242-1065-4), published in December 2006 — includes more than 7,500 entries on 1,300 pages, organized by five different indexes. The first edition led to a 1938-39 radio show hosted by Kane on the Mutual Broadcasting System. The second edition of the book was published in 1950, the third in 1964, the fourth in 1981 and the fifth in 1997.