String Theory for Undergraduates [pdf]

This looks like a fun class! If only I were young again.

Unfortunately, I took undergraduate physics 20 years ago, and I can barely remember the Lorentz transformation and the Hamiltonian, so I couldn't get very far in reading this. I guess I need "String theory for people who took senior-level physics 20 years ago but don't remember much of it except what they've read in popular physics books by Brian Greene and Paul Davies".