Education scholar Diane Ravitch, once the darling of conservative critics of American public education, recanted her support of charter schools, standardized testing and test-based teacher culling last year. Now she?s coming to Madison in March to give her views on the future of public education in a talk co-sponsored by the Wisconsin Academy of Sciences, Arts and Letters, the UW-Madison School of Education and the Wisconsin Center for Education Research, which is part of the School of Education.