First stop: Origami! My JMM math fun began today with a “Folding compact manifolds without boundary” by Thomas Hull, part of the AMS Special Session on Origami Methods and Applications. This was a fascinating talk. One of my favorite features was Dr. Hull’s explanation of (a very elegant mathematical definition of) what kind of transformation constitutes an origami-type folding: it “preserves zig-zagness”. Also, he led the audience to consider the extension of origami folding to higher-dimensional spaces–I had somehow never pictured folding three dimensional space before, and it was fun. This session, organized by Hull, Robert Lang, and Erik Demaine (all featured in the excellent origami documentary Between the Folds), continues today in room 4C-3 at 2:15 with a talk by Demaine entitled “Computational Origami is Hard”.