A&HH6577/Component-2

From Studyplace

When something changes from one state to another, as water does when liquid water freezes into solid ice or boils away as gaseous steam, a change of phase occurs. Historical observers sometimes describe far-reaching developments as changes in historical phase in which the conditions before and after seem to have undergone a transformation, a change of state, with problems and possibilities emerging in the new state that were wholly different from those characteristic in the old. Human demographics, economic and technical productivity, cultural and educational participation, and social and geographical situations have all displayed unprecedented changes starting roughly in the mid-nineteenth century. Early in the twentieth century, awareness took hold that these changes presented an unusual pedagogical problem, inducing deep uncertainties about traditional verities, and still these uncertainties have yet to be dispelled.