Richard Feynman Magnets
Why Physics Stack Exchange recommends it
Physics Stack Exchange answerers point people to it when someone asks how magnetic force or fields really work, since Feynman explains why 'why' has no final answer outside a chosen framework.
Recommended by 2 people across 2 different months, 2015 to 2016.
What it is
A 7.5-minute clip of Richard Feynman answering an interviewer's question about how magnets work, in which he explains that 'why' questions depend on the framework of explanation you accept. It is an excerpt from a BBC interview, re-uploaded to YouTube by a user called street1338.
What people said
Recommends Emre · 2016-02 · Physics Stack Exchange · on “How does a magnetic field cause objects to move?”
I am not a physicist but i am a curious person like you. So i seached for the same answer for so long, finally i got my answer from this Richard Feynman video in which he describes it perfectly for an uneducated mind like mine. [this video]
Recommends Arturo don Juan · 2016-11 · Physics Stack Exchange · on “Is the Momentum Operator a Postulate?”
As a quick extension to the above answers, let me repeat that none of quantum mechanics is "derived" from any preceding theories. Yes, there are many correspondences that are quite striking - canonical quantization, geometric quantization, action waves in Hamilton-Jacobi theory, extending the deBroglie dispersion relation (what @dmckee was talking about), etc. - and many people utilize these to motivate the development of quantum mechanics from the viewpoint of classical physics. But at the end of the day, quantum mechanics is the more fundamental theory, so it is postulated (they call them "postulates of QM" for a reason :). Another way of seeing it is that recovering quantum mechanics from
Cites user12029 · 2015-07 · Physics Stack Exchange · on “How does a magnet cause magnetic force and its magnitude/direction?”
[this video] "When you ask a 'why', you have to be in some framework that you allow something to be true". That's FAR FROM the final say on this (which is why I'm not posting it as an answer), so don't let the video discourage you, but it's important to keep in mind.