Principles of tools and machines NOW<br/>b Encyclopedia of hundreds of tools and machines from ancient times to the present b<br/><br/><br/><br/><br/><br/>The Boston Globe-Horn Books The Best Books in the Nonfiction Sector, , The COPUS Science Book Award, the Science Book Award, and the best-selling bestselling book in the world for 28 years. "The principle of tools and machines", which was introduced in Korea, has been updated with cutting-edge technology and machines, and it has come back to the revised edition "NOW of tools and machines". The revised edition introduces new machines such as smart phones, LCD screens, electronic paper, 3D printers, and quad-copter (drone). All the tools and machines are easy to understand with pictures, so they look like books of all ages, from curious children to adolescents who dream of science, majors and machine-loving adults.<br/><br/>Hundreds of tools that have changed our lives from windmills, cars, computers, WI-FI, electric guitars, robots, space probes and virtual reality, starting with ancient leashes and plows. It is a comprehensive encyclopedia of the machine. What is the relation between the lever, the hydraulic ladder, the dental drill and the windmill? This book explains the basic principles of moving machines and shows a variety of tools and machines with principles applied. This book contains vividly the human aspiration and the result of pursuing a more advanced form of life. It proves the laws of motion, develops machines using natural forces such as air and water, and unveils the product of the era of opening the digital world. It is a very attractive book that can draw the past, present, and future of our life with various tools and machines that have appeared along with human history.