교육 기관: Nguyen D L•
2021년 8월 11일
Thank you so much Professor Hafner,
Your physics demo give me deeper insight into Electric Field. I am sure other student would learn and love your class. I am more confident to tutor my son in Electricity portion of E&M now.
교육 기관: Muhammad E•
2022년 2월 10일
on of the best tutor i learned from him alot of simplicity in explanation the idea ♥
교육 기관: David W•
2022년 2월 25일
Too many mistakes in the problems.