Mona Lisa Was '83 Percent Happy,' Analysis Finds

As art historians and Nat King Cole fans can attest, the allure of Leonardo da Vinci's most famous portrait lies in its subject's inscrutable smile: Is it wry? Melancholy? Reflective?

Actually, Mona Lisa was just in a pretty good mood, according to a team of researchers at the University of Amsterdam.

Using computer software intended to identify people's emotions on the basis of photographs, the researchers determined that she was "83 percent happy," according to a report on the

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