Whilst trawling through a backlog of Stephen Downes’ outpourings I saw this.
You can find it here:
I know it is aimed at K-12, which isn’t actually us here, but pretend you hadn’t noticed that bit and have a look anyway as there are some nice resources here (including a link to a very friendly man trying very hard to demonstrate calculus before he’d worked out how to use his pen …).
The blog the link takes you to often has some interesting bits and pieces on it, so is worth a look every now and then !
Mr Downes has been even more philosophical, abstract and theoretical than usual recently, but still manages to find some good stuff, so it is always worth glancing before deleting …