66.Two characteristics of ex post facto research are

67.Children whose mental age is lower than chronological age are called

68.”Educational change and social change are independent, but which is the cause and which is the effect cannot be determined” are the view of

69.As Huxley pleaded for the introduction of “ a complete and through scientific culture” into schools, he is claimed to be

70.Which school of philosophy of education stresses the direct study of men and things through tours and travels?