When a stone is identified as a borderline case between two grades, the system uses an optimisation technique, called a genetic algorithm, to explore the different ways in which the stone could be cut to maximise its value.

ECONOMIST: MONITOR

She would divide her paintings into squares, halving and quartering, before working and she used a similar technique with her sculptures which she made out of stone, plastic and fiber glass and on which she concentrated from the 1960s.

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And even though it's been a very long time since the first knives were crafted out of stone, we haven't given up on that ancient manufacturing technique.

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