Wireless Charging of Phones From Across the Room? The Tech Inches Closer

Wireless energy transmission has been possible since Thomas Edison's time, and in the last several years, especially, with robots gaining mobility and electric vehicles building consumer demand, we've heard almost daily promises that the days of tangled power cords are numbered. So why do the vast majority of EV drivers and smartphone users, not to mention robots, remain tethered to plug-in chargers and cables?