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A sharp separation between “science” and “non‑science,” used to dismiss entire fields or practices as illegitimate. It draws a clean line based on a single criterion (e.g., falsifiability, empiricism, peer review) and then uses that line to exclude anything that doesn’t fit. The Demarcation Guillotine ignores the messy, contested history of demarcation and the fact that many legitimate disciplines (history, mathematics, design) don’t meet strict criteria. It is a favourite tool of scientistic debaters who want to purge “pseudoscience” without engaging with its content.
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