Simple experiments illustrate mechanical principles.

Introduces six simple machines, describing how they work in more complex machinery and how they are used every day.

This book explores the idea of time travel from the first account in English literature to the latest theories of physicists such as Kip Thorne and Igor Novikov

This book is about the story of modern machines, and how they do the world’s work. We shall see how raw materials, such as metals, wool and cotton fibers, and

This new edition of what has become a standard account of Western expansion and technological dominance includes a new preface by the author that discusses how