Principle of least action

Paul M Sutter: The Most Important Idea in Physics: The Principle of Least Action – Ask a Spaceman! at https://www.youtube.com/watch?v=UuqpCBZoX3M

You say mostly the right words, but mathematics is powerful when you share the equations and methods and diagrams and geometry. Physics and engineering are powerful when you share the diagrams, equations, data and real examples. NONE of that is improved by waving hands and emphatic words. You have devolved to entertainment, not real science and teaching. One example worked out, and links to tools would have done 100 times what you only talked about and did not clearly demonstrate. You have so much potential energy, it could become action. Richard Collins, The Internet Foundation

What you said is important, what you gave is too little.