COVER—Princeton University Art Museum; 1—Courtesy Miroslav Bárta; 3—(clockwise from top left) Marcin S. Przybyƚa, Courtesy Archeodunum, Courtesy Ewa Kedzierska, The Metropolitan Museum of Art, New York, 56.171.39, Photo: A. Yurman, The Natural History Museum/Alamy Stock Photo; 4—Azoor Photo Collection/Alamy Stock Photo; 6—Courtesy University of Massachusetts Boston’s Fiske Center for Archaeological Research/Plimoth-Patuxet; 9—Courtesy Emma Loftus; 10—Chris Howes/Wild Places Photography/Alamy Stock Photo, Hemis/Alamy Stock Photo; 11—Courtesy Archeodunum (4); 12—The Natural History Museum/Alamy Stock Photo, Courtesy Liam Brady (2); 13—Courtesy José Luis Pérez and Antonio Mozas, University of Jaen, Spain (2); 14—Photo: A. Yurman (2), William J. Damitio/© 2020 Brownstein, Tushingham, Damitio, Nguyen and Gang (2); 16—© 2019 J. Goodinson, scientific advisor J. Svolos, The Metropolitan Museum of Art, New York, 56.171.39, Wiltshire Museum, Courtesy of Tees Archaeology; 20—Courtesy Ewa Kedzierska (3); 21—Copyright…