The system, developed at the Horticulture and Food Research Institute of New Zealand, uses a punnet that traps the volatile compounds fruit emit. As the fruit ripen, the colour of the label changes in response to changing concentrations of these compounds.Link
Since pears need to soften before they achieve their best flavour, shoppers often squeeze the fruit to test them, which can damage them, says Ron Henzell, who led the research team.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.