... Unless otherwise acknowledged, all photographs are the copyright © of Dorling Kindersley, a division of Pearson ISBN: 0-328-13767-7 Copyright © Pearson Education, Inc All Rights Reserved Printed ... televisions, or radios Now we communicate using all these things Radio Television Computer Technology has changed Long ago tools and machines were different Look around your world What tools and machines ... acknowledged, all photographs are the copyright © of Dorling Kindersley, a division of Pearson wheel and axle ISBN: 0-328-13767-7 a simple machine used to move things Copyright © Pearson Education, Inc All...