The boomerang circuit, by Murray Leinster 69048 [Author: Murray Leinster] [Link: https://www.gutenberg.org/6/9/0/4/69048] [Files: 69048-0.txt; 69048-h.htm] Thanks to Greg Weeks, Mary Meehan and the Online Distributed Proofreading Team at http://www.pgdp.net Regards, Jacqueline