Now, making a comparison to a mainstream commodity option requires a little work on the back of an envelope.

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As the work came in, Herman pushed the fashion envelope, introducing polyester blends to McDonald's, knitwear to FedEx and cuffless shirts to the casinos of Las Vegas.

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Miners who work for Murray are sometimes forced to push the envelope when it comes to safety, he said, and are afraid to speak up for fear of being fired.

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The U.S. government has meanwhile gone to great lengths to prevent development of an effective AIDS vaccine, first permitting work to be carried out only on vaccines which use the AIDS envelope lipoprotein.

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