As noted at Wikipedia: "Public diplomacy...broadly speaking, is the communication with foreign publics to establish a dialogue designed to inform and influence. There is no one definition of public diplomacy, and...definitions vary and continue to change over time. It is practiced through a variety of instruments and methods, ranging from personal contact and media interviews to the Internet and educational exchanges." On this installment of ST, we explore this hard-to-pin-down idea with a scholarly expert on such. Our guest is Dr. Justin Hart, Associate Professor of History at Texas Tech University. He's the author of "Empire of Ideas" (Oxford University Press) and has also written several several articles and book chapters on propaganda, public diplomacy, and how both have related over the years to U.S. history as well as U.S. foreign policy. Dr. Hart spoke last night here at TU in a free-to-the-public address co-presented by the Tulsa Global Alliance and the TU Center for Global Education, and he'll be giving a private talk tonight at the Tulsa Committee on Foreign Relations. His address this evening will focus specifically on "America's Public Diplomacy: The Roots of Our Contemporary Challenges."