Tiny particles can hold big secrets. Haiyan Gao, chair of Duke's physics department, probes inside atoms to study the structure and spin of neutrons. One aim of her research is to design experiments that test for the existence of a new fifth fundamental force of nature, in addition to the strong, weak, electromagnetic and gravitational forces. Gao answers questions about her research during a live "Office Hours" webcast interview March 15, 2012. Ashley Yeager, a science writer in Duke's...

Steve Nowicki, dean of undergraduate education at Duke, explains the university's new student housing assignment system in a live "Office Hours" webcast interview February 16, 2012. Joining him is Duke Student Government President Pete Schork. Duke senior Sarah Krueger conducts the interview. Learn more at http://www.dukeofficehours.com.

In a live "Office Hours" interview Feb. 9, 2012, Duke political science professor Sunshine Hillygus takes viewer questions about the science of public opinion polling and the art of campaign communications. She is joined via Skype by Neil Newhouse, Mitt Romney's lead pollster and a 1974 graduate of Duke. Duke senior Sarah Krueger conducts the interview.

Brian Murray, director for economic analysis at the Nicholas Institute for Environmental Policy Solutions, answers viewer questions about the state of international climate change policy negotiations, during a live "Office Hours" webcast Dec. 1. He is joined via Skype by Jeff Gustafson, a Duke Nicholas School graduate student attending the United Nations climate talks in Durban, South Africa, with his class. Hosting the show is James Todd, a senior writer in Duke's Office of News and...

In a live, "Office Hours" webcast interview November 17, 2011, Gary Glass, assistant director for outreach and developmental programming at Duke's Counseling and Psychological Services, answers viewer questions about student mental health and coping with the pressures of college.

Charles Clotfelter, a professor at Duke University's Sanford School of Public Policy, takes viewer questions about the role of athletics at American universities, during a live "Office Hours" webcast interview, November 10, 2011. Learn more at http://www.dukeofficehours.com.

Ellen Hemphill is director of undergraduate studies in Duke's Department of Theater Studies. She took questions from online viewers on how acting skills can be applied to life offstage, during a live "Office Hours" conversation at Duke's Bryan University Center, November 3, 2011.

Robert Korstad, a Duke University professor of history and public policy, takes viewer questions during a live "Office Hours" conversation October 27, 2011, on how the current Occupy movement compares with post social movements. He is joined by Duke sophomore Anastasia Karklina, a participant in the Occupy Duke demonstration. Learn more at http://www.dukeofficehours.com.

In a live, interactive "Office Hours" conversation, Duke Professors Noah Pickus and David Schanzer take viewer questions on immigration and domestic security in advance of a campus talk by Secretary of Homeland Security Janet Napolitano on October 20, 2011.

A live "Office Hours" conversation with Kimberly Jenkins, the university's senior adviser to the president and provost for innovation and entrepreneurship. She is joined by Duke senior Sidney Primas. David Jarmul, Duke's associate vice president of news and communications, conducts the interview. Learn more at ‪http://entrepreneurship.duke.edu‬.

Duke University Professor Wahneema Lubiano answers questions about using literary tools to understand images in the media and objects in everyday life during a live "Office Hours" conversation October 6, 2011.

Duke Chapel Dean Samuel Wells and alumna Marcia Owen answer viewer questions about their new book, "Living Without Enemies: Being Present in the Midst of Violence," during an "Office Hours" conversation September 29, 2011.

Duke University Professor Kathy Rudy, author of "Loving Animals," discusses her philosophy of animal advocacy and answers viewer questions during a live "Office Hours" webcast, September 22, 2011.

Biology professor and geochemist Robert Jackson in Duke's Nicholas School of the Environment performed one of the first peer-reviewed studies on the environmental consequences of hydrofracking. In a live "Office Hours" webcast September 15, 2011, he answers questions about his study. Learn more at http://www.officehours.com.

Sanford School Dean Bruce Kuniholm and his son Jonathan, both combat veterans, answer viewers' questions during an "Office Hours" conversation September 8, 2011. Learn more at http://www.dukeofficehours.com.

Drawing on their decades of experience on archaeological digs in Israel, Duke University Professors Carol and Eric Meyers take questions from online viewers about the charged combination of archaeology, the Bible, politics and the news media, during an "Office Hours" conversation September 1, 2011. Learn more at http://www.dukeofficehours.com.

Tom Rankin, director of Duke's Center for Documentary Studies, previews films of the 2011 Full Frame documentary film festival during a live '"Office Hours" webcast interview on April 15, 2011.

The economics and ethics of college sports was the topic of a Duke Magazine-Office Hours conversation April 8, 2011, in Duke's Card Gym. Addressing the issue were Charles Clotfelter ('69), Z. Smith Reynolds Professor of Public Policy Studies, and author of the new book "Big-Time Sports in American Universities"; Alan Fishel (J.D. '86), lead counsel on Bowl Championship Series issues; Chris Kennedy (Ph.D. '79), Duke's deputy director of athletics; and Nancy Hogshead-Makar ('86), Olympic...