I use EK audio osmosis when I've driving somewhere far, washing dishes, taking naps, doing chores, walking long distances, basically when I'm doing anything that keeps me from physically studying for mcat. I think it has some sort of subconscious affect. I was taking one of the AAMC tests and there was an FS question asking about why the spleen is necessary, and even though I haven't really read up on or studied the spleen, I remember hearing the voice of the A.O. guy saying that the spleen is where old RBCs are destroyed and uptaken. It certainly wouldn't hurt to get one of these audio things.