Originating from a continuing education class, this book touches a variety of amusing and fascinating aspects about numbers. The author intrigues and challenges his audience with both simple number theoretic topics such as prime numbers and cryptography, and themes of daily needs and pleasures such as keeping track of time and enjoying music. Puzzles and exercises at the end of each chapter offer additional inspiration, and numerous illustrations accompany the reader. Furthermore, a number of appendices provides in-depth insights on Pascal triangle, Mersenne keyboard, the Rubik cube, and many others.Written in an engaging and witty style and requiring only basic school mathematical knowledge, this book will appeal to both young and mature readers fascinated by the curiosities of numbers.