In January 2002, a writer for ZDNet said it was "almost time for wearable computing." His supposed proof? The Xybernaut Poma Wearable PC, a $1,500 contraption that consisted of a 10.9-ounce Windows CE device (and bundled with pocket versions of Internet Explorer, Outlook, Windows Media Player and Word), an optical mouse and a color display mounted on a headband that let you view 800 x 600 images on the go. There were just way too many pieces to the Poma puzzle for it to take off. Now that more than a decade has passed, all you need is a smartphone paired with a heads-up display like Google Glass or a smartwatch to tap into wearable computing's potential.