Remote control electronic biobots

By integrating light-sensitive biological muscle tissue, 3D printed scaffolding and wireless microelectronics, researchers at the University of Illinois Urbana-Champaign and Nothwestern University created a first-of-its-kind class of remote controlled hybrid "eBiobots."
For more information, see "Remote control of muscle driven miniature robots with battery-free wireless optoelectronics," published in Science Robotics.

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why is the sound in one ear?