9 wireless phone chargers on sale right now for no good reason

Cords are *so* 1882. No, literally — that's the year Thomas Edison invented the first known power distribution system. (The more you know.) 
With recent developments in Qi technology, which uses electromagnetic induction to transfer energy, supported smartphones can now be charged wirelessly. No longer must our precious devices be tethered down by cords; these days, you can just place your phone on a wireless charging mat or pad to give it a thorough juicing-up. (Of course, you do hav