This teacher is not vesy good even for secondarry school!  His demonstration is very poor, I couldndt  understand how it is possible, that hy is MIT teacher ???!!! His geometric demonstration and explanation is really bad !!!!####[['teacher', 'Instructor', 'NEG'], ['demonstration', 'Teaching_Setup', 'NEG'], ['geometric demonstration', 'Teaching_Setup', 'NEG'], ['explanation', 'Course_General_Feedback', 'NEG']]