A Minnesota researcher is raising eyebrows in education circles... with a new study that says poverty does not cause children to do poorly in school. Economist Samuel Myers is director of the Roy Wilkins Center for Human Relations and Social Justice at the University of Minnesota. He analyzed test results in hopes of explaining why minority students do poorly compared with white kids. His conclusion runs counter to what many educators have long assumed. Minnesota Public Radio's John Biewen reports. Samuel Myers says he was frustrated with the widespread assumption that poverty causes the poor academic performance of many minority children. 50-thousand eighth graders took the Minnesota Basic Standards Test last year. Bla