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PENGUIN BOOKS

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First published in the United States of America by Viking Penguin, a member of Penguin Group (USA) LLC 2014
First published in Great Britain by Allen Lane 2014

Copyright © Steven Pinker, 2014

Illustration credits
Page 52: MacNelly editorial, © Jeff MacNelly – distributed by King Features
57: CartoonStock
61: James Stevenson/The New Yorker Collection/www.cartoonbank.com
79: Shoe © 1993 Jeff MacNelly – distributed by King Features
202: Bizarro used with permission of Dan Piraro, King Features Syndicate and the Cartoonist Group. All rights reserved.
256 and 260: Ryan North
284: © 2007 Harry Bliss. Used with permission of Pippin Properties, Inc.
294: Copyright 2008 by Debbie Ridpath Ohi. Reprinted by permission of Curtis Brown, Ltd.
297: William Haefeli/The New Yorker Collection/www.cartoonbank.com
298: Zippy the Pinhead © 1997 Griffith – distributed by King Features Syndicate, world rights reserved
301: xkcd.com
Credits for certain illustrations appear adjacent to the respective works.

Cover image by Kayla Varley

All rights reserved

The moral right of the author has been asserted

ISBN: 978-1-846-14551-3