Finland just pushed electricity through open air. No cable. First ever nation to achieve this. Researchers at the University of Helsinki and the University of Oulu fired high-intensity ultrasonic waves to carve an invisible channel through the air, then guided a spark down it. Lasers handle the rest. Power-by-light beams energy to receivers where you really don't want a conductor: nuclear plants, high-voltage stations. Radio-frequency harvesting pulls microwatts from ambient waves, enough to retire millions of disposable sensor batteries.