Why is Spud FUZZYYYY!

So I know this doesn't really have to do with the rubric I got, but I am very curious about the fuzzyness of my plants. I looked it up and it said that it was because if the stem was placed underground it would be able to work as a root. AND THEM IT CLICKED...the fuzz is root hairs...that are not even on the root! It kind of blew my mind. So if I put the stem under the ground the hairs would be able to help. Also I think the probably help with protecting from stuff hitting the stem. I am going to feel really awkward and all of this I'm writing is just wrong. Well, that's my update for today!