When I was a freshman in High School I was blessed to have an amazingly good chemistry teacher.
At his own personal expense he had made a special edition “circular slide rule” made to fit in a shirt pocket. The back side had a periodic table of the elements, and it had a slide out page of numerical scientific constants, and chemistry “rules of thumb.”

He was always calm. He promised all of his students that
“even though Chemistry is challenging, step by step we all are going to pull through this together get a 3 or better on the AP Chemistry Exam.”

Year after year he delivered on this promise.

Very few around today like that.

Super supportive and non-threatening, but he had fought as a Marine in the Pacific in WW-II