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In this photo from Jan. 15, 2014, Brian Otis, Google X project lead, holds a contact lens Google is testing to explore tear glucose in Mountain View, Calif. After years of scalding soldering hair-thin wires to miniaturize electronics, Otis 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 Photo/Jeff Chiu)

In this photo from Jan. 15, 2014, Brian Otis, Google X project lead, holds a contact lens Google is testing to explore tear glucose in Mountain View, Calif. After years of scalding soldering hair-thin wires to miniaturize electronics, Otis 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 Photo/Jeff Chiu)

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