Our earlier conversation about gram weenies, another name for ultralight backpackers, prompted a San Diego, California, man to write with the story of Bill Lear, the inventor of the LearJet, who once said he’d trade his own grandmother for a one-pound reduction of weight in the design of one of his aircraft. As a result, Lear’s engineers adopted the term grandmother as a synonym for one pound. This is part of a complete episode.

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