Hi rc.phelps, 

Thank you for sharing your request content regarding this topic.

I've passed this feedback along to the appropriate team. As we grow and expand, we’re continuing to add new content to offer a better education at Khan Academy. Please note that investing more heavily in our content is actually one of our major initiatives.

Thank you for being part of our community and please take a look at our article that explains Khan Academy's Content Principles.

Best, Jo