By CBS 2 Chicago Staff

CHICAGO (CBS) — Engineers have developed what they say is the world’s smallest flying structure — the size of a grain of sand.

World’s smallest flying structure. (Credit: Northwestern University)

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The “micro-flier” is actually a winged microchip that spins through the air.

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The goal is to eventually use it to monitor air pollution or airborne illnesses.

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CBS 2 Chicago Staff