UA physicians Professors David G. Armstrong, a podiatric surgeon and Janko Nikolich-Zugich, an immunologist, in February became the first physicians invited to take part in the prestigious University of Arizona College of Science Lecture Series. The program, which covers “grand challenge” topics like relativity, climate change, and evolution this year took on “living beyond 100“. “It is an honor to participate in this series, noted Armstrong, Professor of Surgery and Director of the UA’s Southern Arizona Limb Salvage Alliance (SALSA). “It is even more amazing to see thousands of people packing Centennial Hall and an overflow hall to watch lectures on science.” Nikolich-Zugich’s lecture: “The Biology of Aging: Why our Bodies Grow Old as They Do” and Armstrong’s lecture “Repair, Regeneration and Replacement Revisited” were part of a six-lecture weekly series hosted by Joaquin Ruiz, Executive Dean of the College of Science. They joined professors Shane Burgess, Carol Barnes, Vincent Del Casino and Paul Cohen in covering the latest on the science, biology, ethics and geography of our aging world. The links to the lectures are below.