Tiny robots with no motors can fly and steer using sound waves

https://www.livescience.com/technology/robotics/scientists-build-tiny-robots-without-motors-that-can-fly-using-sound-waves-alone

Scientists build tiny robots without motors that can fly using sound waves alone

LiveScienceScientists build tiny robots without motors that can fly using sound waves alone A century-old trick for tuning musical instruments has been repurposed to power robots that fly, float and steer themselves using nothing but sound waves. www.livescience.com

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Very cool. Can't wait for millions of these to be eavesdropping on every convo in the world and collecting our info.

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