"Pseudoscience is not a real thing. The term is a negative category, always ascribed to somebody else's beliefs, not to characterize a doctrine one holds dear oneself. People who espouse fringe ideas never think of themselves as "pseudoscientists"; they think they are following the correct scientific doctrine, even if it is not mainstream. In that sense, there is no such thing as pseudoscience, just disagreements about what the right science is. This is a familiar phenomenon. No believer ever thinks she is a "heretic," for example, or an artist that he produces "bad art." Those are attacks presented by opponents. Yet pseudoscience is also real. The term of abuse is used quite frequently, sometimes even about ideas that are at the core of the scientific mainstream, and those labels have consequences. If the reputation of "pseudoscience" solidifies, then it is very hard for a doctrine to shed the bad reputation. The outcome is plenty of scorn and no legitimacy (or funding) to investigate one's theories. In this, "pseudoscience" is a lot like "heresy": if the label sticks, persecution follows"-- Provided by publisher.