*59%*:**Student Objections to and Understanding of Non-Cartesian Unit Vector Notation in Upper-Level E&M***53%*:**Improving Students' Understanding of Quantum Mechanics***45%*:**Tapping into Juniors’ Understanding of E&M: The Colorado Upper-Division Electrostatics (CUE) Diagnostic***44%*:**Analyzing student understanding of vector field plots with respect to divergence***43%*:**Longer term impacts of transformed courses on student conceptual understanding of E&M***43%*:**Writing Position Vectors in 3-d Space: A Student Difficulty With Spherical Unit Vectors in Intermediate E&M***42%*:**Improving student understanding of Dirac notation by using analogical reasoning in the context of a three-dimensional vector space***41%*:**Improving students’ understanding of quantum measurement. II. Development of research-based learning tools***40%*:**Improving Students’ Understanding of Quantum Measurement***40%*:**Improving Students' Understanding of Lock-In Amplifiers***39%*:**Contrasts in Student Understanding of Simple E&M Questions in Two Countries***39%*:**Improving Students' Understanding of Electricity and Magnetism***39%*:**Curriculum development to improve student understanding of rolling motion***36%*:**Transforming the junior level: Outcomes from instruction and research in E&M***36%*:**Testing Students’ Understanding of Vector Concepts***36%*:**Test of understanding of vectors: A reliable multiple-choice vector concept test***36%*:**A research-based approach to improving student understanding of the vector nature of kinematical concepts***34%*:**SEI: Junior E&M I Course Materials - Student Difficulties***34%*:**Improving students' understanding of quantum mechanics by using peer instruction tools**