This episode originally aired on Feb. 20, 2015. Dr. Jonathan Rubin, a historian of the Medieval Levant at Tel Aviv University, specializes in the production of knowledge in the Crusader Kingdom of Jerusalem in the 12th and 13th centuries. He talks to host Gilad Halpern about how the Crusaders' encounters with local societies - beyond the initial indignation - led to theological, economic, and scientific developments.