Today’s world is driven by technology. It’s changed the way we communicate over mobile phones and the Internet, the way we travel in hybrid cars and on hoverboards, the way we build high skyscrapers and underground metro systems, and the way we treat patients and investigate crimes. The newest developments in technology change the way we live, but few of us actually understand the inner workings of our most sophistacted gadgets and machines. With this fourth volume of The How It Works Book of Amazing Technology, we aim to answer the questions behind today’s technology, from small appliances like a drill, to huge and intangible concepts like cloud computing. Get closer to understanding our world, and start reading!