Almost everyone knows there are kosher hot dogs and pickles, but you have to be a real aficionado of kosher to know that there also is such a thing as a kosher sound system. Seeing a niche market, a small Washington, D.C.area research company last year received a patent for just such a system. And in what must be a textbook example of how a new technology can be transformed into other products, the company is developing a listening device based on the same principles that would allow farmers to hear insect larvae munching away inside grain elevators.

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