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Scientific American (ISSN 0036-8733), Volume 319, Number 6, December 2018, published monthly by Scientific American, a division of Springer Nature America, Inc., 1 New York Plaza, Suite 4500, New York, N.Y. 10004-1562. Periodicals postage paid at New York, N.Y., and at additional mailing offices. Canada Post International Publications Mail (Canadian Distribution) Sales Agreement No. 40012504. Canadian BN No. 127387652RT; TVQ1218059275 TQ0001. Publication Mail Agreement #40012504. Return undeliverable mail to Scientific American, P.O. Box 819, Stn Main, Markham, ON L3P 8A2. Individual Subscription rates: 1 year $49.99 (USD), Canada $59.99 (USD), International $69.99 (USD). Institutional Subscription rates: Schools and Public Libraries: 1 year $84 (USD), Canada $89 (USD), International $96 (USD). Businesses and Colleges/Universities: 1 year $399 (USD), Canada $405 (USD), International $411 (USD). Postmaster: Send address changes to Scientific American, Box 3187, Harlan, Iowa 51537. Reprints available: write Reprint Department, Scientific American, 1 New York Plaza, Suite 4500, New York, N.Y. 10004- 1562; fax: 646-563-7138; Subscription inquiries: U.S. and Canada (800) 333-1199; other (515) 248-7684. Send e-mail to Printed in U.S.A. Copyright © 2018 by Scientific American, a division of Springer Nature America, Inc. All rights reserved.

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