Early 20th Century Lightbulb [Getty Images]

An image of a reproduction early 20th century Victorian style clear light bulb with glowing exposed quad looped tungsten filament from a collection of electrical artifacts at the Museum of Science and Industry, Chicago, Illinois, August 13, 2012. (Photo by J. B. Spector/Museum of Science and Industry, Chicago/Getty Images)

Archive Photos Museum of Science and Industry, Chicago