Contents

01 February 2019
Vol 363, Issue 6426

About The Cover

Cover image expansion

COVER This sculpture by Karol Lacko of Dmitri Mendeleev and the columns of his periodic table, radiating outward from his head, stands in front of the Faculty of Chemical and Food Technology of the Slovak University of Technology in Bratislava, Slovakia. This year marks the 150th anniversary of Mendeleev's initial publication of the table as organizing principle and predictive tool. See the special section on page 464.
Photo: Vladimir Simicek/AFP