Antimatter, more precise iPhone antimatter. So if you touch with your back the back of an iPhone device to NFC beam (if any iphone will ever will have NFC) both phones explode!
Yea, I wish they did replace the glass back before Production hits, as that one reviewer dropped his (I know, dropping will still break Gorilla Glass), but I read Phil here and another review post up the back scratches pretty easy. WTF?? I thought that was the PURPOSE of Gorilla Glass, so as to NOT get scratches?!?!? I understand dropping it, well your on your own there depending if it's a 5 inch drop on your lap or 3 feet+ to the floor... We know Gorilla Glass or not, dropping it will do damage.
I hope they change the back, but I'm sure now it's too late