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MANY FORMS OF GLASS

The traditional recipe for making glass, such as these Roman urns (left), is thousands of years old: silica (sand), sodium carbonate (soda) and calcium oxide (lime).Today, glass is also made from thermoplastic polymers that form polycarbonates, varieties of which are made into bulletproof glass (right), eyeglass lenses and DVDs. Credit: From left: G. Dall’orto/Wikimedia Commons; Marco Prandina/iStockphoto

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