Do you know which radio DJ is credited with coining the term ‘rock and roll’? Or which future U.S. President stars alongside a chimp in “Bedtime for Bonzo”? Test your knowledge or quiz your friends with these 52 colorful illustrated 1951 Trivia Challenge Playing Cards about the year's celebrities, sports, events, movies and music. A Key Card is provided with all the answers, as well as a pair of Jokers loaded with fascinating sports stats. Plus, the cards double as a regulation playing card deck!