How does science, which prizes openness and peer review, operate in the secret world of national security? While much today is known about the role of scientists during the Manhattan Project, nuclear weapons are only one part of a larger story about “secret science.” How does secrecy affect scientists and the scientific convention of openness? Over decades of the Cold War, and often still today, some scientists must contend with the strictures of national security, which often requires operating in secrecy. In this discussion, BBC.com contributor, Sharon Weinberger, will look at how secrecy changes science, and the role of scientists in wartime. From the use of “secret patents,” to the ethics of scientists on the battlefield, this discussion covers the sometimes-uneasy relationship between science and secrecy.