For all you geeks, here's a little Science Club porn - Britney Spears guide to Semiconductor Physics: semiconductor physics, Edge Emitting Lasers and VCSELs. It is a little known fact, that Ms Spears is an expert in semiconductor physics. Not content with just singing, in the following pages, she will guide you in the fundamentals of the vital laser components that have made it possible to hear her super music in a digital format.
Wow. If this doesn't help you remember the classwork, perhaps studying will.