Thank you, this feels helpful. Though I don't think I missed a part of the article, I feel more like the author did ;) What I still don't get is what the diff

Thank you, this feels helpful. Though I don't think I missed a part of the article, I feel more like the author did ;) What I still don't get is what the difference between high and low viscosity looks like on a particle level. I don't understand why he introduced the collision between two molecules and then never explained that.. :)