We develop a statistical framework that uses lights growth to augment existing income growth measures, under the assumption that measurement error in using observed light as an indicator of income is uncorrelated with measurement error in national income accounts.

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"The scientists are right to be extremely cautious about interpreting these findings, " said Jim Al-Khalili, a physicist from the University of Surrey, who suggested that a simple error in the measurement is probably the source of all the fuss.

BBC: Light speed: Flying into fantasy

People who do actually know their physics have made the same point: that what has been discovered is a measurement error, not a flaw in the basic theory.

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But the strategy worked, because United States agencies were allowed to proceed by trial and error, continually adjusting their policies over time in response not to ideology but to hard measurement of the results against societal goals.

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Much of the placebo effect seen in clinical trials is the combination of the natural tendency of patients to get better and measurement error.

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