Its official: Leonardo da Vinci's Mona Lisa was 83 percent happy, 9 percent disgusted, 6 percent fearful and 2 percent angry. Nicu Sebe at the University of Amsterdam in the Netherlands tested emotion-recognition software on the famous enigmatic smile. His algorithm, developed with researchers at the Beckman Institute at the University of Illinois, Urbana-Champaign, examines key facial features such as the curvature of the lips and crinkles around the eyes, then scores each face with respect to six basic emotions. …
