If they hit the bottom surface before passing through, they are reflected off and absorbed at the top - and thus are not detected at the other end of the plates.

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"There are growth plates at the end of the bones, " said Dr. Leslie Spry, a spokesman for the National Kidney Foundation.

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We taught them to pass the salt around the table rather than over it, how they should place their knife and fork on their plates at the end of a meal, and the proper way to lean their soup or cereal bowl when spooning out the last drops.

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The illegal fish eventually end up in Chinatown, the Fulton Fish Market, various city mom-and-pop seafood stores and even on the plates of high-end Manhattan restaurants.

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They particularly dislike the front end, with its four headlights the size of pie plates.

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But they have less chance of becoming big exporters of finished products, because the end users, such as car makers, may prefer having their sheets, plates and tubes knocked up locally, thus making it easier to change specifications rapidly, and reducing the need to keep big stockpiles in case of shipping delays.

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