DK Guides This new edition of the award-winning, bestselling guides takes a colourful look at the nuts, bolts and circuitry of a host of things that whirr, whiz, clunk, buzz and beep!What really makes the things around us tick? Did you know that the principle behind the zip fastener also governed the building of the pyramids? Or that the dentist"s drill is a direct descendant of the first windmill?The inner workings of hundreds of machines and devices are explained in this fun, colourful and unique look at technology through time.Perfect for anyone who"s ever wondered what really makes things tick.