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In today's show, Carla A. Hills recalls this photograph of a three-way handshake with Canada's Minister Wilson and Mexico's Secretary Serra following the conclusion of NAFTA negotiation. Courtesy of American Bar Association hide caption

itoggle caption Courtesy of American Bar Association

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The evolution of exoskeletons, hanging on the wall at Ekso Bionics in Richmond, Calif. Peter Earl McCollough for NPR hide caption

itoggle caption Peter Earl McCollough for NPR