Nightly News | February 02, 2012
>>> if you look at them, they are slightly different. there is da vinci 's " mona lisa " and another " mona lisa ." her smile more wry and the valley is more vivid, but now comes a scientific analysis that shows this " mona lisa " was not only painted by one of da vinci 's students, but was done at the same time as the real masterpiece. it may have been the case of a student working alongside the master.