Level: K DRA: 20 Science Strategy: Infer/Predict Word Count: 312 2.3.11 Build Vocabulary by Jennifer Duffy HOUGHTON MIFFLIN Online Leveled Books 1033021 H O UG H T O N MIF F L IN by Jennifer Duffy PHOTOGRAPHY CREDITS: Cover (l) JUPITERIMAGES/ Comstock Images/Alamy, (r) © Corbis. 1 (t) JUPITERIMAGES/ Comstock Images / Alamy. (b) © Corbis. 2 Thomas Barwick/Getty Images. 3 © Lawrence Manning/Corbis. 4 © Jupiter Images/Comstock Images/Alamy. 5 (t) Ton Kinsbergen/Photo Researchers, Inc., (b) Masterfile Royalty-Free Division. 6 © Bettmann/Corbis. 7 Herbert/Hulton Archive/Getty Images. 10 © Corbis. Copyright © by Houghton Mifflin Harcourt Publishing Company All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage and retrieval system, without the prior written permission of the copyright owner unless such copying is expressly permitted by federal copyright law. Requests for permission to make copies of any part of the work should be addressed to Houghton Mifflin Harcourt School Publishers, Attn: Permissions, 6277 Sea Harbor Drive, Orlando, Florida 32887-6777. Printed in China ISBN-13: 978-0-547-02900-9 ISBN-10: 0-547-02900-4 1 2 3 4 5 6 7 8 0940 18 17 16 15 14 13 12 11 If you have received these materials as examination copies free of charge, Houghton Mifflin Harcourt School Publishers retains title to the materials and they may not be resold. Resale of examination copies is strictly prohibited. Possession of this publication in print format does not entitle users to convert this publication, or any portion of it, into electronic format. This is the story of the typewriter and the computer. People used typewriters long before they used computers. 2 2_000000_VR3_1BL_Typewriters.ind2 2 1/18/08 3:58:52 PM When the typewriter was invented, it was very big. It was also hard to use. People could write words faster than it took to