On this page you may find the answer for: For about 20 years after its invention it had few practical uses then suddenly it revolutionized grocery checkouts & home audio. This clue was last seen on Final Jeopardy July 29 2022 TV Game-Show. If you are looking for older Jeopardy clues then we highly recommend to visit our archive page over at Final Jeopardy.
CLUE: For about 20 years after its invention it had few practical uses then suddenly it revolutionized grocery checkouts & home audio
ANSWER: Laser
