The ultrasound generator used in this technique can focus its energy into a space about the size of a grain of rice.

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Michael Cembalest, chief investment officer of JP Morgan, says he is more interested in areas that work to counter-act rising food prices by adding innovation and expanded planting space, like seed companies, infrastructure and harvesting equipment makers, grain processors and fertilizer companies, than in agricultural commodities, which may be risky if conditions change earlier than expected.

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The grain could be the result of a smaller, closer impact or even a piece of space dust that has drifted down to earth intact.

ECONOMIST: Paleoforensic science