Harry Potter and numerous sci-fi novels have glamorized the idea of a cloak of invisibility, but Duke University engineering professor David R. Smith has come up with a blueprint for the real thing. His research on a prototype cloak was selected as one of the top-ten scientific breakthroughs of the year in 2006 by Science Magazine. In a live, "Office Hours" webcast interview February 23, 2012, Smith answers questions on the science of invisibility. Karl Bates, director of research communications at Duke, conducts the interview.