The Universe The planets The Moon Space exploration Stargazing Northern skies Southern skies Physics Electricity Chemistry The elements Biology The human body Skeleton Muscles The brain Computers Inventions Numbers Geometry Cars Tractors Trucks and diggers Trains Motorbikes Aircraft The story of ﬂight Bicycles ISBN 978-0-2411-8698-5 Printed and bound in Hong Kong by Hung Hing Printing Group Discover more at A CIP catalogue record for this book is available from the British Library.

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CONTENTS DK LONDON Project editor Lizzie Davey Senior art editor Mabel Chan Editors Ann Baggaley, Vanessa Daubney, Sarah Macleod, Catherine Saunders, Rona Skene, Sarah Tomley Designers Laura Brim, Alison Gardner, Mik Gates, Tessa Jordens, Steve Woosnam-Savage Managing editor Paula Regan Managing art editor Owen Peyton Jones Jacket design development manager Sophia MTT Producer, pre-production Nikoleta Parasaki Producer Mary Slater Publisher Andrew Macintyre Associate publishing director Liz Wheeler Art director Karen Self Publishing director Jonathan Metcalf Consultants Alexandra Black, Kim Bryan, Giles Chapman, Sheila Dickle, Robert Dinwiddie, Richard Gilbert, Sawako Irie, Philip Parker, Penny Preston, Carole Stott, Tony Streeter, Marcus Weeks, Philip Whiteman, Chris Woodford, John Woodward DK DELHI Project editor Rupa Rao Project art editor Mahipal Singh Editors Deeksha Saikia, Sonam Mathur, Agnibesh Das Art editors Amit Varma, Vikas Chauhan, Ranjita Bhattacharji Senior DTP designers Shanker Prasad, Harish Aggarwal DTP designers Nityanand Kumar, Rajesh Singh Adhikari Picture researcher Nishwan Rasool Jacket designers Suhita Dharamjit, Dhirendra Singh Managing jackets editor Saloni Talwar Managing editor Kingshuk Ghoshal Managing art editor Govind Mittal Pre-production manager Balwant Singh Production manager Pankaj Sharma First published in Great Britain in 2015 by Dorling Kindersley Limited, 80 Strand, London WC2R 0RL Copyright © 2015 Dorling Kindersley Limited, London A Penguin Random House Company 10 9 8 7 6 5 4 3 2 1 001 – 197156 – Oct/15 All rights reserved.

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