Radio or television show designed to test the knowledge, luck, or skill of contestants or experts. Among the shows popular on U.S. radio were Dr. I.Q. (1939–49), Information, Please (1938–48), and The Quiz Kids (1940–53). The genre was adopted by television and cash awards were increased, so that radio's $64 Question became television's $64,000 Question. In the mid-1950s, to increase their shows' popularity, some producers began feeding answers to contestants who had been chosen to win. An accusation of unfair practices on Twenty-one (1958) led to a government investigation and the quick demise of the big-money shows. The game show later regained popularity when it was revived in formats with lower stakes and easier questions, as on Jeopardy! and Wheel of Fortune. At the turn of the 21st century, game shows such as Who Wants to Be a Millionaire boasted large cash prizes and gained popularity in prime time, and reality shows like Survivor adopted aspects of the game show genre.