books.google.com - Mathematical puzzles are designed to strengthen creative problem-solving by encouraging the discovery of simple solutions to seemingly complex problems...https://books.google.com/books/about/Aha_Insight.html?id=4SEPNAAACAAJ&utm_source=gb-gplus-shareAha! Insight
Martin Gardner is the author of more than seventy books on a vast range of topics including "Did Adam & Eve Have Navels?", "Calculus Made Easy", & "The Annotated Alice". He lives in Hendersonville, North Carolina.