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08/28/2017 - Medford/Somerville, Mass. - Chris Swan, Associate Professor of Civil and Environmental Engineering, poses for a portrait on August 28, 2017. (Alonso Nichols/Tufts University)

08/28/2017 – Medford/Somerville, Mass. – Chris Swan, Associate Professor of Civil and Environmental Engineering, poses for a portrait on August 28, 2017. (Alonso Nichols/Tufts University)