The hard truth is: Some teacher's don't know the material (and surrounding skills) as well as they should. They are embarrassed to have students inadvertently

The hard truth is: Some teacher's don't know the material (and surrounding skills) as well as they should. They are embarrassed to have students inadvertently point this out with questions and would rather have that embarrassing "problem" just "go away" instead of learn to be a better teacher. I say this as the son of two teachers who enjoyed their craft. Boy did I hear a lot of stories growing up ...