That is a classic example of someone who should not be teaching, for two reasons. One, if he or she is a good teacher then they will explain the material in such a way that the students will understand and learn. Two, since the teacher was obviously not good at number one, they need to be willing and capable of going over the same material they already had so those that didn't get it the first time, if any, will get what they or their parents are paying for, an education.

A professor that can't teach is the antithesis of what a professor is, or should be. When I was in college I encountered professors who felt they were too good to actually teach and I had no problem confronting them and asking what they are doing in the classroom with students that really want to learn, when they have forgotten how to teach.
One of them was a computer science teacher and the particular subject was the Fortran language. I had no doubt the teacher knew Fortran well, just didn't know how to teach computer language to beginners very well, which was his job. I was taking the class for the credits. I had learned Fortran several years earlier and it was one of the main languages I used at work. Functionally, I was better at it then the so called expert, the professor. He did his best to best me but I just continued to Ace his class. At the end of the semester, my grade was a perfect A, 100 % based on the scores of all the quizzes, tests and reports. I could have actually skipped the final exam and still walked away with an A. On the final exam, just to bust the chop Buster's chops, I wrote down all my pervious grades for the class in an algebraic formula and the result of the equations was "= A", signed my name, placed the test booklet on his desk and left. Still got that A.

I don't refer to them as professors. Once you stop calling them teachers, some tend to forget their function is to do exactly that, teach. And what is a professor that can't teach, good for? A desk jockey I suppose, or research, but don't put them in front of a classroom.

Just found a simple solution to removing stuck filters from lenses. I recently purchased a 10 stop circular ND filter for one of my lenses ... and couldn't remove it! Went online and read solutions such as put a rubber band around the outer edge of the filter, but that didn't work. Then I read how you can buy special wrenches from B&H photo ... but you need different wrenches for different size lenses.
Then came across a great article. Basically, turn your mouse pad to the other side, so the side with a slight grip is facing upwards. With your lens on your camera, place the front of the lens onto the mouse pad, apply slight downward pressure, and turn your camera counter clockwise. It loosens right up! Works every time.
This techniques applies grip pressure on the "entire" front of the filter lens ... which is why it works!

Now my IBM Assembler language teacher was the exact opposite. She was from Brazil and her name was Bianca. She had a bit of an accent, not too bad, was very intelligent, friendly, a great teacher and stone cold gorgeous. Problem with her class was, as she was explaining something I'd be looking at her and imagining being at impenima beach. In lab, she would come over and help her students all the time. She'd either sit next to you or lean over you while explaining some difficult logarithm or structure or whatever. And she smelled nice also. I really had to work hard in that class and not because of a bad teacher. I missed getting an A by one stinking lousy point. But since B stands for Better than a C, I really had little to complain about.

I had a programming language concepts teacher that lived and breathed structured programming. The course wasn't even about any specific language, just concepts and basically the right and wrong way to do things. This guy absolutely hated my single most favorite instruction of all, GOTO. His philosophy was, there's no place in a computer program for GOTO. That's fine for proprietary languages like ADABAS Natural but Fortran can be real powerful if one knows the art of the goto.

Now that I'm retired I think back on some of the pretty amazing stuff I wrote in years past and how much of it is still being used and how some of it, there's no one there that could probably work on some of it. Oh well, not my problem.

Just found a simple solution to removing stuck filters from lenses. I recently purchased a 10 stop circular ND filter for one of my lenses ... and couldn't remove it! Went online and read solutions such as put a rubber band around the outer edge of the filter, but that didn't work. Then I read how you can buy special wrenches from B&H photo ... but you need different wrenches for different size lenses.
Then came across a great article. Basically, turn your mouse pad to the other side, so the side with a slight grip is facing upwards. With your lens on your camera, place the front of the lens onto the mouse pad, apply slight downward pressure, and turn your camera counter clockwise. It loosens right up! Works every time.
This techniques applies grip pressure on the "entire" front of the filter lens ... which is why it works!

Oie, sounds like the assembly class was rather difficult, to keep your mind on the language, that is...

CALL was one of my favorites. I was doing modular programming way before it became vogue. I figured why keep repeating operations? Especially if I only had 64K of memory!
Loved programming, still do HTML, PHP, and some Java Script (But Java blows my mind anymore...)
Reverse engineering code into Assembly language was really fun!
Thanks for the trip down <core> Memory Lane!