Late last spring,a doctoral student worked late into the night.As she doodled(涂鸦),her chemistry thesis took on a life of its own,transforming into a comic book.Veronica Berns,28,was working on her Ph.D.in chemistry at the University of Wisconsin-Madison.Berns said she long struggled to explain her work to her parents and friends.The self-described comic book fan said she began drafting her thesis on