Thanks for taking the time to do this. :-)
Frankly given the nature of expii I'm shocked that the forum seems to be so dead. Hopefully it'll liven up.
On a largely unrelated note, how is the calculus section of expii? I see it's still in beta. I'm getting ready to go into calculus and I was wondering if it's fleshed out enough to be Good primary resource.
If I understand your description correctly though, me using it will help build the tool?
I'm curious, how much of our learning information is tied to our identity and how much of it is made anonymous?