On December 5, 1934, the American Foundation for the Blind laid a time capsule into the cornerstone of its headquarters, then under construction. It was a historic event attended by a renowned deaf-blind advocate, Helen Keller; AFB’s founder, M.C. Migel; and an associate editor of the New York Times, John H. Finley. The capsule, welded shut in copper and buried, kept its contents a mystery for decades.