General Lecture: The Hardest Math I've Ever Really Used
Abstract. What's the hardest math I've ever used in real life? Me, myself, directly - not by using a cellphone or a GPS device that somebody else designed. And in "real life" - not while studying or teaching mathematics?
Short Course: Solving the Rubik Cube Using Group Theory
A newer version of the handout is at Academic Pensieve: 2012-12.
Pensieve. Some scratch work and some programs are at Pensieve/2009-07.
Roaches are seen in full glory at Dori Eldar's Planar Machines' Web Site.