What a fantastic treasure trove of materials! My kids are still too young to dive into most of these materials, which I suppose would be my one disappointment with them. Perhaps in time they'll produce materials for the younger grades!
Otherwise, I didn't look at more than a couple of the lesson PDFs/PPTs but they cover quite a breadth of material across several disciplines, and it looks like they make it quite straightforward to download all the materials and use them in a classroom setting -- for free, at that! The graphic design is quite high quality to my eyes, which shows nice attention to detail. Also, a minor point, but as a father to girls, I'm encouraged to see that one of their two main photos on the welcome page features a group of young women in a lab instead of (stereotypically) young men.
Anyway, thanks for sharing this resource with us! I trust many will find it useful!