Studying logic and theory of science in Munich 1994-1998 and some Mathematics afterwards I was quite disgusted by the pyramids of formalization that let even the formal concepts themselves get lost in a gaze instead of running like a golden thread through their subjects. .
As school- and privat-teacher in mathematics I noticed how mathematical understanding suffers on the wrong attempt to be most complicated and elitist
Ideas are lucent.
The MIT Course about Differential Equations (Math for Natural Scientists) showed how to understand the most complicated mathematics by simplest means.