This book is a collection of four short works by famous science author Yakov Perelman. They are: Amazing Mazes, With A Single Stroke, Young Physicist at a Camp, and Quick Arithmetic: Thirty simple tricks of mental arithmetic. These ones include serious notions in the fields of mathematics and physics. This book does not seek to replace school textbooks. Instead, its purpose is to entice the reader and especially the young one to engage in the study of mathematics and physics.