We are still doing Chern classes in the seminar, and today I'm speaking about the multiplicative structure of the Chow ring of a Grassmannian. It'll include some example computations, for which I prepared a little handout. Without further ado, here it is. It's not that spectacular, and certainly not original (it is based on the visualisation I found in 3264 and all that).
The actual weekly blogpost will go online tonight, and it will feature rational surface singularities.