Thomas Edison. Thomas Alva Edison (February 11, 1847 â October 18, 1931) was an American inventor and businessman, who has been described as America's greatest inventor. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and the long-lasting, practical electric light bulb.
Pipe dope, or pipe joint compound, is a gooey compound used to seal the connection between threaded pipes and fittings. Because the threads in pipes and fittings still leave an air gap between the two surfaces, the gap must be filled to make it water tight (or gas tight for gas lines).
HDPE or PE-HD. When the little triangle has a 2 inside and the code of either HDPE or PE-HD under it, you know that the plastic it adorns is made from high-density polyethylene. Like PET plastics, HDPE plastics are picked up by most curbside recycling companies.