Marcia Bartusiak is the author of Thursday's Universe, Through a Universe Darkly, and Einstein's Unfinished Symphony. Her work has appeared in many magazines, including Astronomy, National Geographic, Discover, Science, and Smithsonian. A two-time winner of the American Institute of Physics Science Writing Award, she teaches in the graduate program in science writing at the Massachusetts Institute of Technology and lives in Sudbury, Massachusetts, with her husband.