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A science, from the Latin, scire, to know, is a body of knowledge that is constructed via observation, hypothesis, experimentation, and logic for the purpose of explaining and predicting events or behavior. Observation, experimentation and critical reasoning all play crucial roles in the advancement of scientific knowledge. A discipline is widely regarded as a science if its practitioners apply the 'scientific method'. According to falsificationists, this involves the formation of a testable hypothesis, followed by ongoing attempts to refute this hypothesis via critical reasoning, experimentation and observation. A hypothesis that has been rigorously tested under a wide variety of conditions, and which remains unrefuted, is tentatively accepted as a useful approximation to the truth, and attains the status of theory; future observations may yet refute it.

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