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It's a Bird, It's a Plane, It's a … Spy?

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Science  23 Mar 2012:
Vol. 335, Issue 6075, pp. 1433
DOI: 10.1126/science.335.6075.1433

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Summary

In 2011, AeroVironment unveiled a new crewless aircraft called the Nano Hummingbird. With a wingspan of 17 centimeters and a weight of 19 grams, the robot is hefty for a hummingbird. But it can hover in place and fly in any direction (including backward) as fast as 18 kilometers per hour. It can fly through doorways and be steered by a remote pilot using only video from an onboard camera. All of these abilities met or exceeded the targets for a second-generation "nano air vehicle" funded by the U.S. Defense Advanced Research Projects Agency.