Apple says it will stop making its iconic iPod this year, after a more than two-decade run. When it first came out, the iPod was a sleek alternative to bulky CD or cassette players. And the “touch circle” feature below the two-toned screen felt like a revolution. Over the years, the iPod got even smaller: no screen, just a clip and some buttons on the cute, little iPod Shuffle. By the time the last iPod Touch model came out three years ago, the iPod looked more like the other innovation it inspired, the iPhone. It got us thinking about how the device changed mobile tech. Marketplace’s Kimberly Adams speaks with Patrick McCray, who teaches about the history of technology and science at University of California, Santa Barbara. He says it was the iPod’s size that was groundbreaking.

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