Stefanie Gänger is Professor of Modern History at the Heidelberg University. She is the author of A Singular Remedy. Cinchona Across the Atlantic World, 1751–1820 (Cambridge University Press, 2020) and Relics of the Past. The Collecting and Study of pre-Columbian Antiquities in Peru and Chile, 1837–1911 (Oxford University Press, 2014). Jürgen Osterhammel is Professor Emeritus of Modern and Contemporary History at the University of Konstanz. His books in English include The Transformation of the World: A Global History of the Nineteenth Century (Princeton University Press, 2014). With Akira Iriye, he is the general editor of A History of the World (6 vols., Harvard University Press, 2012–24).