Lots of people have guessed that it's Corning Gorilla Glass being used on the iPhone.
Gorilla Glass is being used on a lot of other tech items..


http://www.corninggorillaglass.com/?utm_...atured-products

http://www.corninggorillaglass.com/applications
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http://davidbearphotography.com/

"If it turns out that President Barack Obama can make a deal with the most intransigent, hard-line, unreasonable, totalitarian mullahs in the world but not with Republicans? Maybe he’s not the problem."