"Although pseudoscience is a fairly common epithet, it is not exactly universal. Scientists do not just call anything they do not like “pseudoscience.” They are perfectly happy to declare many of their peers’ work to be “bad” or “substandard” science. “Pseudoscience” is used in a targeted way, at certain times, and against specific enemies. This implies that there is no unified pseudoscience; the various doctrines labeled “pseudosciences” over the last two centuries actually have very little in common with one another besides being hated by assorted scientists."