Stanford researchers suggest that the way to move beyond the legal, physiological, and physical constraints on the energy that can beam to an implant may be to move away from radio waves, and switch to ultrasound instead. Not content just to wax philosophical about these issues, they have now demonstrated proof of principle for ultrasound power transmission into the brain -- or at least into a three-centimeter-thick slab of chicken meat.
from ExtremeTech http://www.extremetech.com/extreme/191705-stanford-creates-tiny-high-speed-ultrasound-powered-brain-implants
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