Restriction of the study of science to lecture and text book, defeats the very essence of scientific method, a method which rests firmly on observation. Here, in George Barr's book, illustrated by John Teppich, the young student is provided with a mobile laboratory in which he can actually observe the workings of scientific laws and formulas. Magnetism, electricity, rocket propulsion, acceleration, , and light are all explored through familiar home devices and the book is appended with an extensive bibliography which permits the student further investigation of any of the above areas.