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Shannen Dee Williams, associate professor of history at the University of Dayton, speaks to her students during a class April 21 in Dayton, Ohio. Williams spent 14 years researching America's Black nuns, and her history of them, "Subversive Habits," will be published May 17. Williams found that many Black nuns were modest about their achievements and reticent about sharing details of bad experiences, such as encountering racism and discrimination. (AP photo/Aaron Doster)

Shannen Dee Williams, associate professor of history at the University of Dayton, speaks to her students during a class April 21 in Dayton, Ohio. (AP photo/Aaron Doster)