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The most mysterious painting in the history of European art just got a little more mysterious. For centuries, Madrid's Prado Museum has held what was believed to be a mere replica of Leonardo da Vinci's masterpiece, the Mona Lisa. But researchers at the museum recently discovered that their copy wasn't just any copy. Thanks to the use of infrared technology, they deduced that the work was not only painted in Leonardo's workshop, by one of his students, but that it was done at the same time as the master was completing the original.