Best Math & theory (other) Videos
The 8 Math & theory (other) videos here were recommended by different people across different months. Choose by who it is for: 2 introductory, 2 intermediate, 3 for a general viewer, and 1 for someone who wants the harder derivation. Most of them are a lecture. What they share is that a derivation is walked through at classroom pace instead of a conclusion being dropped. Channels you will keep seeing include Insights into Mathematics, Steve Brunton, Stanford.

Pythagoras' theorem (a) | Math History | NJ Wildberger
The first lecture of N J Wildberger's History of Mathematics course, starting with Pythagoras' theorem and following Stillwell's text.

Control Bootcamp: Overview
The opening lecture of Steve Brunton's Control Bootcamp, covering the kinds of control and why closed-loop feedback matters.

Lecture 1 | Convex Optimization I (Stanford)
The introductory lecture of Stephen Boyd's Stanford Convex Optimization I course (EE 364A).

Conrad Wolfram: Teaching kids real math with computers
Conrad Wolfram argues that the part of math taught in schools, hand calculation, is tedious and mostly irrelevant to real mathematics.

Why do people keep getting this wrong‽
Matt Parker of Stand-up Maths explains why people keep making the same mistake with millions and billions, using a Bloomberg cash calculator example.

The Great Debate @ARITH23: John Gustafson and William Kahan
A 95-minute recorded debate at the ARITH23 computer arithmetic conference between John Gustafson, proponent of unums/posits, and William Kahan, architect of IEEE 754 floating point.

The real meaning of MPH- The Original- TCHappenings
A viral amateur video in which a woman struggles to explain what miles per hour means.

On Mathematical Maturity (1) Thomas Garrity
Thomas Garrity discusses mathematical maturity, a concept mathematicians use for professional development, and how it can inform teaching, mentoring and careers.