Considers the history behind simple devices, such as the wheel, the ramp and the pulley, that represent the very beginnings of the invention story. Explains the basic scientific principles behind each, so that the reader can understand how and why they still form essential parts of many a modern gadget or complicated machine. Also focuses on the technological developments of two other major areas of invention, cameras and computers. Includes simple experiments and projects which give the reader insight into the inventors mind. Suggested level: primary, intermediate, junior secondary.