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The caption for the mood meter photo in the April 15 issue mistakenly identified the creators as M. Ehsan Hoque G, Professor of Media Arts and Sciences Rosalind W. Picard ScD ’91, and Javier H. Rivera G from left to right. The creators should be, from left to right, Javier H. Rivera G, Professor of Media Arts and Sciences Rosalind W. Picard ’86, and M. Ehsan Hoque G.