Car glass had to be something that was very difficult to break. The process of annealing this substance enabled it to be made harder to damage. Toughening up or strengthening glass also made it much more resistant to breakage as well as made it shatters into little items rather than burglarize large rugged ones.
What is Pligg?

Pligg is an open source content management system that lets you easily create your own user-powered website.

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