Who is black? That's the question the (1)ne Drop Project seeks to answer. The project, created by Dr. Yaba Blay, features photographs of people who identify as black, African-American, biracial, and other identities—but whose physical appearances may provoke curiosity, or even disbelief, in strangers. Dr. Blay will appear on CNN's Black in America 5 to talk about what it means to be black. But this week she made some time to talk to us about her work.