Conversely, explanations based in supernatural causes are not considered to be scientific. Scientific hypotheses must be testable and falsifiable. Experimentation and observations can increase our confidence that a hypothesis is a correct explanation of a phenomenon, but can never absolutely prove a hypothesis to be true. The conclusions of science are subject to change. New studies, which might utilize new techniques and equipment, may reveal that previously accepted theories need to be modified or changed entirely.
Great science is replaced by greater science.