Knew this wasn't for me when he had to introduce what a derivative was with a weird metaphor. I like this approach to teaching things (it's Feynman-y) but half

Knew this wasn't for me when he had to introduce what a derivative was with a weird metaphor. I like this approach to teaching things (it's Feynman-y) but half the time I end up hung up on trying to understand a particular author's hand-waving for a concept I already grok.