This undated photo released by Google shows a contact lens Google is testing to explore tear glucose. After years of scalding soldering hair-thin wires to miniaturize electronics, Brian Otis, Google X project lead, has burned his fingertips so often that he can no longer feel the tiny chips he made from scratch in Google?s Silicon Valley headquarters, a small price to pay for what he says is the smallest wireless glucose sensor that has ever been made. /AP