*62%*:**Student understanding of symmetry and Gauss's law of electricity***62%*:**Student understanding of Symmetry and Gauss's law***58%*:**Upper-division student understanding of Coulomb's law: Difficulties with continuous charge distributions***50%*:**Improving Students' Understanding of Electricity and Magnetism***49%*:**Improving Students' Understanding of Quantum Mechanics***48%*:**Improving Students' Understanding of Quantum Mechanics***48%*:**Coulomb's Law and Electric Field Package***47%*:**Improving students’ understanding of quantum measurement. II. Development of research-based learning tools***47%*:**E&M Tutorial I: Coulomb’s Law, Superposition Principle, and Symmetry***46%*:**Students' Use of Symmetry with Gauss's Law***46%*:**Improving Students’ Understanding of Quantum Measurement***45%*:**Improving Students' Conceptual Understanding of Conductors and Insulators***45%*:**Gauss' Law - Point Charge***45%*:**Student understanding of the ideal gas law, Part II: A microscopic perspective***45%*:**Improving Students' Understanding of Lock-In Amplifiers***44%*:**Student understanding of the ideal gas law, Part I: A macroscopic perspective***43%*:**Fluctuations in Student Understanding of Newton’s 3rd Law***43%*:**Symmetry and Gauss's Law Conceptual Evaluation***43%*:**A research-based approach to improving student understanding of the vector nature of kinematical concepts**