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Mona Lisa

Mona Lisa

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V.A SolThis recent undated photo provided Friday July 23, 2010, by the CNRS (National Center of Scientific Research) shows the Mona Lisa painting being examined with a non-invasive technique called X-ray fluorescence spectroscopy to study the thickness of paint layers and their chemical composition.

The enigmatic smile remains a mystery, but French scientists say they have cracked some of the Mona Lisa's secrets..

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