Mona Lisa's Smile 83 Percent Happy

A computer has been used to decipher the enigmatic smile of Leonardo da Vinci's Mona Lisa, concluding that she was mainly happy. The painting was analysed by a University of Amsterdam computer using "emotion recognition" software. It concluded that the subject was 83% happy, 9% disgusted, 6% fearful and 2% angry. For more information at BBC or AP.