An energy harvesting technology that its developers say will be able to turn ambient radio frequency waves into usable electricity to charge low power devices...
http://phys.org/news/2015-09-radio-frequency-harvesting-tech-unveiled.html
...is that right...
http://5hvnzon.blogspot.com/search?q=power+lines
...If they can have wireless chargers and wireless headphones, they should be able to have wireless power grids...
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