The drive-in theater was the creation of New Jersey chemical company magnate Richard M. Hollingshead, Jr. In 1932, Hollingshead nailed a screen to trees in his backyard and set a projector on the hood of his car. After applying for a patent for his creation, Hollingshead opened the first drive-in the next year. Though it only operated for three years, the concept soon caught on in other states. How many drive-ins are estimated to have existed in the US at the height of their popularity? Discuss