I remember discovering 3Blue1Brown on YouTube the summer after I finished high school. After watching his Essence of Calculus series, I felt as if I'd learned calculus for the first time, despite acing by IB exams that had supposedly tested two years of calculus.
In the Stanford Math department, rumor has it that Grant Sanderson (the YouTuber behind 3Blue1Brown), didn't finish his honors thesis because he insisted on discovering the proofs his work depended on for himself.
Many view this kind of learning as “out of reach” for the average kid. I believe it is precisely such a view that makes higher math out of reach for kids: they spend half a decade of their life (at least!) learning abstract concepts they neither understand nor see the importance of.
The point of studying and learning concepts are to move them into “working memory”, such that no working memory is devoted to unravelling them when the student attempts to solve a problem requiring knowledge dependent on these prior concepts. I built Unravel to accelerate how fast concepts move into someone's working memory.
Video generated in response to prompt "Explain the Riemann sum"