Canada once tried to build a UFO detector. They detected something. In 1954, inside a small shack at Shirley’s Bay near Ottawa, Canadian engineer Wilbert Brockhouse Smith assembled instruments meant to detect whether flying saucers left measurable traces in the physical world. His Project Magnet was official, obscure and short-lived — but a newly less-redacted CIA memo shows U.S. intelligence was tracking Canada’s UFO work while it was still underway. My latest piece follows Smith, Project Ma...