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Wireless power transfer/charging. The only thing even alluding to it being possible when I was growing up, was Nikola Tesla's work; and most people thought most of his ideas were bunk.
I sometimes wonder if tesla was successful in his expiements but realized how it could be quickly weaponized or has some other moral implications so that he destroyed all his research.
He's ideas were interesting.
But practically, he didn't have a method to transport power without wires.
Yes, running wires is difficult. But trying to transmit power is staggeringly inefficient.
Im surprised to see this pop up multiple times. If my device more or less is still plugged in with wireless chargers (as it can't really be "off" the pad) it's really not that impressive to me. Not to mention we've been pumping power through the air since the first radio.
If my device could charge anywhere within a certain radius (feet/meters), that would be impressive.