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by Michael Cote.
Original Post: The iPod Scroll Wheel
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The iPod's scroll wheel has been through three iterations. The first one actually rotated; then there was the touch-sensitive one; and finally there's the clickable one found on the iPod Mini and fourth-generation iPod. I'd always assumed that this bit of design genius sprang from Apple Computer's labs. But in fact, I discovered that a company called Synaptics, which primarily makes touchpads for laptops, actually perfected this little piece of navigational heaven, in accordance with Apple's stringent design requirements.
"The secret of iPod's scroll wheel"