Pseudoscience is a broadgroup of theories or assertions about the natural world that claim or appear to bescientific, but that are not accepted as scientific by thescientific community. Pseudoscience doesnot include most obsolete scientific or medical theories (seeCategory:Obsolete scientific theories), nor does it include every idea that currently lacks sufficient scientific evidence (e.g.String theory).There is admittedly thedemarcation problem, but this category comprises well-known topics that are generally considered pseudoscientific by the scientific community (such asastrology) and topics that have very few followers and are obviously pseudoscientific (such as the modern belief in aflat Earth). Thepejorative term itself is contested by various groups for various reasons. Generally speaking, if an article belongs in this category, the article's lead will contain a well-sourced statement that the subject is considered pseudoscience. For people who advocate for these subjects, seeCategory:Advocates of pseudoscience.
