I mean everything. Seriously. Don't need Wikipedia anymore. The days of having to look things up online are gone. Now I can just ask my spouse. They have an answer for everything. And whether I think it's factually correct doesn't matter much... b/c it's their answer or no answer at all. If you feel this way then this shirt is for you, whether you seriously feel this way, or just jokingly, it's a pretty humorous shirt.