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 quasicrystals--a subset of crystals that diverge (相异) from the usual structural characteristics of crystals. Berns quickly concluded that she would be best able to describe the oddball compounds with illustrations.