As the authors state in the preface, "This book is about opportunity and motivation. Great women, sometimes overcoming enormous social obstacles, have made contributions that have changed our world and continue to change our lives." Women have been inventing for centuries, but they just haven't received the publicity and acclaim that many of their male counterparts have. Photographs, diagrams and other illustrations enliven the text. A real plus for teachers and homeschoolers is the activities that accompany each chapter and the resources in the appendices.