The structure that I give to the curriculum comes from a very talented group of youtubers who each have their own little niches of subject area. We use it's funny because the students have recognized that in different units we have different YouTube experts that help us learn about that subject area. And so actually a lot of the curriculum is video based as it's there's no text right there's no single text I can find anywhere I can go over all of this. But luckily there are all these niches on the internet where people will explain things.