"The term "paradigm," from the Greek paradeigma ("pattern"), was used by Kuhn to denote a conceptual framework shared by a community of scientists and providing them with model problems and solutions"

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After a lifetime in this subject, I have concluded that the extraterrestrial hypothesis is one reasonable tentative approach to putting the best-documented and most puzzling UFO reports into a scientifically defensible conceptual framework. By such reports I mean those with credible multiple or independent witnesses, instrumented observations, and physical evidence.

— Jerome Clark