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R IVERHEAD B OOKS
An imprint of Penguin Random House LLC
Copyright © 2019 by xkcd inc.
Penguin supports copyright. Copyright fuels creativity, encourages diverse voices, promotes free speech, and creates a vibrant culture. Thank you for buying an authorized edition of this book and for complying with copyright laws by not reproducing, scanning, or distributing any part of it in any form without permission. You are supporting writers and allowing Penguin to continue to publish books for every reader.
ISBN 9780525537090 (hardcover)
ISBN 9780525537106 (ebook)
ISBN 9780593086377 (international)
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