I did promise to reveal the meaning to "Akili ni nywele, kila mtu ana zake", but forgot. As figured out by Priyanka Khot in the comments, it indeed talks about hair and intelligence. Literally, the quote is "intelligence is like hair, everyone has their own type". I choose to interpret it as, "just as there are lots of types of haircuts, there are lots of types of intelligence". Thus, if someone thinks that they are better than others simply because they think that their particular set of opportunities, beliefs or knowledge is the be-all and end-all, get over yourself, there are all sorts of 'smarts'. I think that there is something in that for all of us.