Portrait of peasant found behind 1887 painting
                                
                                
                                    (Newser) -
                                    European scientists today revealed a Van Gogh portrait of a peasant's head behind one of his paintings, LiveScience reports. Using a new X-ray technique, the researchers pulled out the portrait's brown and red pigments, which Van Gogh covered with Patch of Grass, 1887. The scientists, primarily from Belgium and the...