One of our student just told me it wasn't so obvious.
So let me remind you that we are on reddit.
For those who don't know what reddit is, think about it as a very global forum. There's a bit of gamifications (karma points) but overall it's a forum where you can post either a simple link or a main post. Both can be up/down voted and receive comments.
So don't hesitate to create an account and post any question you have about this class (:
(Yeah unfortunately an uReddit account isn't a reddit account, though they can be linked)