Demarcation problem

The demarcation problem in the philosophy of science is about how to distinguish between science and non-science, including between science, pseudoscience, and other products of human activity, like art and literature, and beliefs. The debate continues after over two millennia of dialogue among philosophers of science and scientists in various fields, and despite broad agreement on the basics of scientific method.

Quotes

 * The borderlines between genuine science and pseudoscience may be fuzzy, but this should be even more of a call for careful distinctions, based on systematic facts and sound reasoning. To try a modicum of turtle blood here and a little aspirin there is not the hallmark of wisdom and even-mindedness. It is a dangerous gateway to superstition and irrationality.
 * Massimo Pigliucci and Maarten Boudry, "The Dangers of Pseudoscience", The New York Times (October 10, 2013)