We don’t know everything about the brain, but we do know some things. First, we know that a large brain does not mean that you are going to be borderline- Tony-Stark-intelligent (or Stephen Hawking, or Albert Einstein, or Marie Curie… you get the idea). There is no correlation between brain size and intelligence. Second, the brain is, quite possibly, the most complex machine that we’ve ever encountered. As such, it obviously can’t be comprehensively labeled or understood through analyses of things like density, shape, weight, etc. It’s just too intricate to be explained through any of the aforementioned factors alone.
Perhaps one of the most pertinent questions (or at least, the question that is most commonly asked) is: Which sex is smarter, men or women? To give you some idea of just how invested individuals are in this question, since the year 2000, over 30,000 scientific papers have been published on the differences (or lack thereof) between male and female brains. So, how can we classify male and female brains?