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You've probably seen QR tags thousands of times, from advertisements in the subway to coupon flyer in the mail to products in the supermarket. They look like stamp-size bar codes, a grid of small black-and-white rectangles and squares, usually with bigger black squares in the corners.

BOSTON--Score one for the little guys. After years of obscurity in the corners of distant planetary systems smaller exoplanets are finally shuffling into the spotlight.