"Make a zero with four one's!" You laugh: 0 = (1-1)+(1-1). "Make a five with four one's! No, don't make a face, make a five." You think. "Make a five with four zero's!" You step back and call both the blue and the white capped guys. "Huh, I wonder who's the crazy here. With four padded walls and three meals a day, who could ask for more?" OK, this book is not about 1's, or about 0's, sorry. This book is about 5's. It will actually ask you to create numbers using four five's, however it will also give you the answers to above and much more. And you don't have to be a genius to solve the queries, however having finished high school and knowing your math...helps. Oh, and being a poet helps as well, after all you will need a lot of imagination.