Arguably one of the two greatest inventions of the twentieth century (WD-40 is the other), duct tape is a strong, pressure-sensitive, fabric-based adhesive tape invented in 1942 by scientists at Permacel, then a division of Johnson & Johnson, as a waterproof tape for sealing ammunication cases during World War II. In addition to its use in sealing air conditioning and heating ducts, duct tape is used for emergency repairs in NASCAR events, military field maneuvers, and manned space exploration, and is generally considered indispensable for sticking almost any thing together. As the saying goes, "If it is stuck and shouldn't be,WD-40 it. It if is unstuck and shouldn't be, duct tape it." See also WD-40.