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classic sheepskin flying jacket. In addition to the cost benefits, a key feature is the music editor that lets the user easily pick the part of the song they wish to set as a ringtone. Some philosophers and scientists, most notably Karl Popper, have asserted that no empirical hypothesis, proposition, or theory can be considered scientific if no observation could be made which might contradict it, insisting on strict falsifiability, see Positivism dispute.[80] Critics allege that economics cannot always achieve Popperian falsifiability, but economists point to many examples of controlled experiments that do exactly this, albeit in laboratory settings.[81][82][83] While economics has produced theories that correlate with observations of behavior in society, economics yields no natural laws or universal constants due to its reliance on non-physical arguments