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| From top, left to right: Photo by H. Armstrong Roberts/ClassicStock; Photo by Sarah A. Friedman; Photo by James Worrell; Courtesy Daniel H. Garrison, Northwestern University; Illustrations by SKWAK; Photographed at the Explorers Club by by Grant Delin; Photo by Dan Burn-Forti/Getty Images; Infographic by Flying Chilli; Veer; Photo by Sheri Gablin; Illustration by Matt Bandsuch; Warren Anatomical Museum, Francis A. Countway Library of Medicine (2); Photo by Devon Jarvis; Photo by Annabel Clark. |