A lovely story about Mendelson that I did not know...thanks for that!
In high school we had such an ugly teacher that when we first met him, we were really "scared".
After a while, he turned out to be one of our best teachers, knowing us so well that we"fall in love of him".
This is because of the way he approached to each of us to encourage us to do our best.
His classes were always with a lot of interest and fun..
What a charming and wise teacher he was, something you couldn't guess according to his look.