I have long conjectured that the reason Amerikan srtudents are ignernt is because their teechers have degrees in Education.
IOW, they know very well how to teach but know nothing to teach.
This has now been confirmed by real academics [Link] It seems that if students are taught by people who know something but not so much how to teach, they learn more than if they are taught by people who know how to teach but have no content to impart.
Gee. That was the way schules were when I was a bairn. All the good teachers lacked certificates; the bad teachers had them.
So when will the system change?
Never is my conjecture.