In this talk I shall motivate and state a comparison between prismatic and a certain crystalline cohomology which was considered by Breuil, Caruso, ...., Bhatt--Morrow--Scholze. Time permitting, I might even be able to explain all the notions that one needs to make sense of what's being compared. This is a joint work with Tong Liu. Speaker(s): Shizhang Li (UM)