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A team of engineers at Stanford has shown that, contrary to earlier models, high-frequency wireless power transmission to a device in the human body is possible. These images show power delivery to the human heart from a 200MHz low-frequency transmitter (left) and a 1.7GHz high-frequency transmitter (right). Red indicates greatest power; blue is least. Note focusing of power on the heart in the right image. Image courtesy John Ho, Stanford Engineering.

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