This is the gift of focus, or wilful denial, and it is something boys are particularly good at. Girls—at least where I grew up—tend to be more emotionally balanced and sane, and therefore find the kind of all-excluding concentration you need to care about dinosaurs, taxonomy, philately and geopolitical schemes a bit worrying and sad. Girls can grasp the bigger picture (i.e., it might be better not to destroy the world over this), where boys have a perfect grip on the fine print (i.e., this insidious idea is antithetical to our existence and cannot be allowed to flourish alongside our peace-loving, free society). Note carefully how it is probably better to let the girls deal with weapons of mass destruction.