Here is a fascinating study by L. Sprague de Camp of controversial and often little-known happenings in science and technology, with an emphasis on the wayward activities of those who dabble in fringe science.The Fringe of the Unknown is in three parts. The first, "Our Ingenious Forebears," examines some of the mysteries and oddities surrounding ancient technologies. Occultists and pseudoscientists often attribute extraordinary knowledge and wisdom...