As many have noted, we're entering a new era where wearable gadgets - from watches and fitness bands to glasses and health aids - are at the forefront of the new technological revolution. A PricewaterhouseCooper's report found that more than 20 percent of U.S. adults already own at least one wearable, and estimates that soon we'll be using them at home and work for a variety of purposes, with as many as 50 billion new connected devices by 2020.