In the first-ever study of its kind, the US is 31st among 56 countries, from Taiwan to the Czech Republic, in the performance of top students in math. That's according to researchers at Harvard, Stanford and the University of Munich in Germany. What are the implications for US competitiveness in science, engineering, technology and other components of the global economy? Paul Peterson, a Harvard University professor and senior fellow at the Hoover Institution, is editor-in-chief of Education Next, which has published the findings.