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(Bloomberg Businessweek) -- Osh Agabi's solution to one of biotechnology's thorniest problems looks like an iridescent purple nipple the size of a steering wheel. For Avery Gilbert and other veteran smell scientists, the battle for smell-sensor supremacy is reminiscent of the late 1990s and early 2000s, when advancements in olfactory research brought about a flurry of electronic devices with catchy names - AromaScan, the Cyranose, ScenTrak. Gardner has since written two books on machine olfaction and helped found three electronic nose companies whose simple, AI-equipped metal-oxide gas sensors for things such as ethanol and carbon monoxide are today found in millions of households, factories, and automobiles. [Extracted from the article]