Jose Vazquez holds a book he found during the D.C. Public Library's banned book scavenger hunt. Jose Vazquez hide caption

Tollbooth cashier Henry Gregorio collects change from drivers at the New Rochelle Toll Plaza on I-95. Gregorio has worked in a tollbooth since 1980. Tollbooths are gradually being replaced by E-ZPass technology. Stephen Nessen/WNYC hide caption

Tour guide Ron Craig points to a photo in Jack Daniel's old office at the whiskey maker's distillery in Lynchburg, Tenn. The photo, taken in the 1890s, shows Jack Daniel (wearing a black-banded white hat and a gray goatee), seated next to an African-American man. He and a second African-American man (top left) are believed to be sons of Nearis Green, who may have helped teach Daniel his trade. Blake Farmer/Nashville Public Radio hide caption

For months, Security, Colo., resident Brenda Piontkowski has regularly visited this vending station to collect drinking water for her family. Grace Hood/Colorado Public Radio hide caption

Susan Glisson, former director of the William Winter Institute for Racial Reconciliation at the University of Mississippi, facilitates discussions on slavery and race. Charles Tucker/Sustainable Equity hide caption

The Rev. Faith Green Timmons interrupts Republican presidential candidate Donald Trump as he speaks during a visit to Bethel United Methodist Church in Flint, Mich. Evan Vucci/AP hide caption