Title: What is a positive Grassmannian? Speaker: Thomas Lam, The University of Michigan The Informal Friday Seminar is a space where members of our research group can explain interesting things to each other in a casual setting. The rules of the seminar are the following: Any question/additional explanation from the audience is allowed. Ego out the window. Examples, examples, examples. If you would like to join the mailing list or contribute a talk, please email finn.klein@sydney.edu.au.