To LuisD,Well it seems as though you may need this book. The statement "We only utilize on average two per cent of our potential brainpower", is entirely different than the more well known statement that you are referring to, "We only use 10% of our brains".He refers to our brain's potential and the not brain itself. While it is entirely true that the we use 100% of our brains, this use is not 100% efficient. This is what he means by the 2% statement. Let's take your review as an example. You used 100% of you brain to write your review. However, the efficiency in which you used your entire brain was around 2% and resulted in your lack of comprehension of a statement which led to your poor decision not to read the book (not that you could comprehend it anyway).