An exclusive reliance on current data would needlessly handicap people’s efforts. history offers a storehouse of information about how people and societies behave. Understanding the operations of people and societies is difficult, though a number of disciplines make the attempt. In Most cases, recourses depend on historical information, except for in limited, often artificial cases in which experiments can be devised to determine how people act. Major aspects of a society’s operation, like mass elections, missionary activities, or military alliances, cannot be set up as precise experiments. Should we all learn history ?