Was Mona Lisa really happy?

According to the University of Amsterdam:

"We now know: Mona Lisa was 83 per cent happy, nine per cent disgusted, six per cent fearful and two per cent angry.
That's the conclusion of a University of Amsterdam computer that applied "emotion-recognition software" to Leonardo da Vinci's work, Britain's New Scientist reports in Saturday's issue.

The algorithm, developed in conjunction with the University of Illinois, tries to assess the human mood by examining key features such as the curvature of the lips and crinkles around the eyes, then makes a score with respect to six basic emotions."

Jeez... now we know...