Put your common sense to the test Jaime Poniachik gathers 101 enigmas. You wont need a calculator or complicated theories to solve them as they are all crushingly simple but beware, simple doesnt necessarily mean easy In the introduction the author reminds us that George Polya, the great Hungarian mathematician, who specialized in problem solving, stated that solving riddles is a practical art, such as swimming or playing the piano: you can only learn it through imitation and practice. Solutions included.