"When Polly Cameron overheard a 10-year-old ask "What's gray?" and a 5-year-old answer "A melted penguin," she decided to investigate this odd kind of humour and began collecting riddles for a book. She enlisted the help of two young friends in the neighbourhood Elizabeth Miles and Callie Angel, as her "editors." They installed a "Joke Box" at the local Palisades Country Store, and received over three hundred riddles from neighbourhood children." source
