Officials at the Menil Collection don't know why a man spray-painted Pablo Picasso's "Woman in a Red Armchair" at the museum, but the act wasn't caught just on surveillance cameras. It also was captured by a bystander with a smartphone camera and subsequently posted on YouTube with a caption naming the alleged perpetrator as a young artist... The damaged artwork, with the spray paint barely dry, was rushed down the hall to the museum's conservation lab, where chief conservator Brad Epley quickly began its repair. The 1929 painting, one of nine by Picasso owned by the Menil, has "an excellent...