Which sport was played on the Moon in 1971?Which team contest was an official Olympic sport until 1920?In which country did chess originate?What do the five Olympic rings stand for?Where and how was basketball invented?What was Monopoly's ancestor designed to show?What was the Rubik's Cube first called?Why is the marathon 26.2 miles?Which country is the home of judo?Why is a zero score called 'love' in tennis?