To answer that question, Dr Maguire plotted the differences in the size of the structure against the amount of time that an individual had been driving a cab.

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The biggest differences in those technologies and the patent for which Apple filed is the amount of power consumed by the product, said Michael Filler, a Caltech postdoctoral scholar specializing in photovoltaics.

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Yet despite the differences in protein and fat intake, the level of body fat increased by essentially the same amount among all the participants.

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