Résume | We discuss an analogue of Deligne's weight-monodromy conjecture for the pro-unipotent fundamental groupoids of smooth varieties over mixed characteristic local fields, proved in the l=p case by Vologodsky and in general in joint work with Daniel Litt. One surprising consequence of this is that any two points in a smooth variety are connected by a canonical choice of "path". Time permitting, we will explain how, in the case of curves, these canonical paths admit a combinatorial description in terms of the reduction graph. This leads to a theory of refined Selmer varieties, and has consequences for the Chabauty-Kim method. |