If the holy grail for smartphones, at least based on recent trends, is bezel-less and foldable screens, the holy grail for wearables is being "unawearable". That's what engineers from UC San Diego's Jacobs School of Engineering call their new tech that reduced a temperature to a size just a little larger than the tip of a No. 2 pencil. And size isn't the only bragging right of this chip. It also uses near zero power, which could make it last ages before running out of juice.