Engineers at North-western University have created electronic microchips, as small as a grain of sand, that can fly. These microchips are so tiny; they are not fitted with a motor, or an engine, but are designed to catch the wind as it flies. Even though they are tiny, the potential of these microchips is huge. These sand sized fliers are decked out with all sorts of tech, including sensors, antennas, data storage, and power sources.
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https://lessonsbeyondthestory.com/videos/what-was-life-like-as-a-soldier-in-west-germany-in-1960-look-at-life-our-history
