Okay, this is a fun competition. Who can make me understand what a derivative is (and why it's called a derivative -- and once you've got one, what do you do with it?)... in the simplest possible terms. I'm still not there. Jo? Help.https://twitter.com/alanalda/status/1122615865864749063 …
There is a series called /The Mechanical Universe/, https://en.m.wikipedia.org/wiki/The_Mechanical_Universe … https://www.caltech.edu/about/news/pioneering-physics-show-mechanical-universe-now-youtube-53331 … watch the first, then the second: Episode 3: The Derivative: https://youtu.be/szCChCc58dg Episode 8: Integration https://youtu.be/w6ynSbzPhjc