"As long as we have science, we will have a process of demarcation that happens every day in the laboratories, field sites, and classrooms of the world. Scientists will decide that some claims are relevant for their research and that some doctrines are not—sometimes so much so that they will be dubbed “pseudoscientific.” This is inevitable, and it is ineradicable. Scientists will always demarcate, because part of what science is is an exclusion of some domains as irrelevant, rejected, outdated, or incorrect. And the more successful science becomes, the more outsiders will want to participate in the process. Some of these will be hailed as brilliant; some others will be run out of town on a rail; most will simply sink without a trace. “Pseudoscience” is not some invasive pathogen that has contaminated contemporary science but that can be fully expunged from the organism with more scientific literacy or better peer review. Pseudoscience is the shadow of science; it is cast by science itself through the very fact that demarcation happens. If pseudoscience is inevitable, then combating it becomes problematic. Either the combatants resemble Sisyphus, pushing the rock up the hill only to have it tumble back down again, or the Æsir, battling the forces of darkness that besiege Valhalla at Ragnarök (and eventually losing)."