French scientist Pascal Cotte has astounded art historians with a major discovery about Leonardo da Vinci’s masterpiece Lady With an Ermine (1489-90), the BBC reports. Until now, it had been assumed that da Vinci’s composition had always included the white ermine, but Cotte’s three year-long investigation has revealed that the Italian artist actually painted the work not in one, but in three clearly differentiated stages. His first version was ... [snip]