I'm good at those subjects, but I don't necessarily care to make them my main focus or main area of interest. I can delve into math and science pretty deeply and hold my own, but the deeper I go into numbers and science, I always end up with this question in my head: "Who really cares?" I mean, we definitely need people who understand science and I'm glad that I have good doctors when I need one and I'm glad we have "earthquake experts" and "nuclear physicists" and all that stuff. They bring expertise to the world in those areas. Like Tallulah mentioned, I'm more interested in humanity and people and personality dynamics and what makes people tick and do the things they do. I like to study organizations (by observing interactions) and relationships, in the workplace, out on the street, etc. Science and math are kinda cool, but for me, at the end of the day - when life is all said and done, when I'm on my death bed, I'm not going to be thinking, "Man, I really wish I had spent more time learning about science. I think I really missed the boat - I should have spent more time on physics and molecules and junk." Instead, I'm more interested in people - either 1-on-1, or "humanity as a whole" - the state of man, the condition we are in, how are we different now compared to 100 years ago, have we lost something of value in that time, how do we get it back, etc.
I think INTP 5w6's are more the science experts, while INTP 5w4's have more the artistic flare - or more of a bent towards humanity. I'm not saying I'm a huge "people person" - I'm fairly introverted and the T wants to focus on organization rather than on people - but I like to study the "organization of people", etc. My signature (education of the heart) ties into this as well. Science is cool, numbers are cool, but if we feed our brains with all this intricate knowledge and neglect the things of the heart and the things having to do with the overall well-being of people, then what good is it? If we can perform complex brain surgery and send people to Mars, that's GREAT! But, if the condition of man (his internal contentment, his abililty to cohabitate and get along well with his fellow man, and to lead a happy, meaninguful life, is he TRULY happy?) - if our condition and our internal happiness are decreasing with each generation, then who gives a crap about science? If those things continue to happen, then we're missing the boat. Science has its place, but at some point we have to set the science aside and focus on one another and our condition.