Week 12: Muddy

I cannot quite put my finger on this weeks lectures. I am not sure what part of the lecture I am confused with, other than the entire lecture. I scored an 8 out of 10 on the quiz, but I feel as though I did not grasp the concept of the lecture as I did the others. I have spent the last hour or so on google trying to find a website that may be able help me understand the concept a little better. I have been unable to find anything. I may be using too broad of a search, but this also reaffirms my thought that I did not grasp the lecture. If I cannot find something on google, I am giving it the wrong parameters. If there is any website, that any of you may reccomend please send me the link so I can check it out.