Electricity flashes from the thimble-topped fingers of traveling “preacher-scientist” George Speake. From the 1940s into the ’60s, he was one in a series of men affiliated with Chicago’s Moody Bible Institute who demonstrated religious faith by demonstrating scientific principles. To create the lightning effect, Speake would stand atop an electric transformer coil. The room would darken. Then, at his command, a brief high-frequency current would travel over his skin, up from his feet and out of his fingertips.Photo credit Margaret G. Zackowitz (National Geographic, July 2010), via Fresh Photons.