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spec: It provides an overview of what we know about mathematics , science , and technology education ; identifies exemplars of good practice ; and identifies obstacles to goal achievement . So it was for Aristotle and the Greek Stoics in the waning days of the Greek classical age . Trade Policy - Policy TopicsExports are important for U.S. agriculture , and a growing share of global agricultural production is traded internationally , making international and individual country trade policy critical to the flow of agricultural goods . Storage management was by incremental reference counting , an a number of internal algorithms ( e.g ., multiset promotion ) exploited the reference count , implementing in-place effects when the count was one . Students ' understanding of operations serves as a foundation for reasoning about mathematics . A significant positive correlation was found to exist between Praxis I Math Test scores and feelings about mathematics using a two-tailed test indicating that prospective elementary math teachers who have higher Praxis I math test scores tend to report having more positive feelings about mathematics . This led , one year later , to a paper published by Hilbert that listed three unanswered questions about mathematics that he and von Neumann had determined to be the most important questions facing logicians and mathematics of the modern era . Optimisation methods of operational research . Design of learning environments that foster the growth and development of model-based reasoning about mathematics and science , design and development of case-based hypermedia tools for teachers .