A second painting of the Mona Lisa by one of Leonardo Da Vinci’s students is now on display at the Prado museum in Madrid, Spain and headed to the Louvre on March 13 to join the famous original. A “technical study” requested by the Louvre shed light on the twin previously believed a recent copy. During the study, experts learned of hidden mountains and other similarities to Da Vinci’s painting, leading them to believe Da Vinci’s student painted it. I wonder how many other works of art have been mistaken because the time was not taken to verify them. Read the full Madrid’s Prado puts Mona Lisa’s “twin” on display story at Reuters.