Why not to do quantum mechanics
As I've mentioned before, I'm now taking the Coursera class in Quantum Mechanics and Quantum Computation. So far, it's a very good class in almost every way and I'd definitely recommend taking it when it's offered again. But even this excellent class has its limitations.
When the class started, I found working on the assignments fairly relaxing. But when we moved to studying multi-qubit systems I found that the assignments almost always make me tensor.