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According to Petronius ( c. 27 AD – c. 66 AD) in his work Satyricon, an inventor brought a drinking bowl to the Roman emperor Tiberius made of vitrum flexile - translated as either flexible or unbreakable glass - which did not shatter but merely dented. Tiberius asked if anyone else was aware of the invention.
Polycarbonate. Polycarbonates ( PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many ...
Essilor partnered with PPG of the United States to develop Transitions, a technology that allows lenses to become darker or lighter depending on the intensity of ambient light. With the acquisition of Gentex, Essilor also launched the polycarbonate Airwear lens, a lightweight, unbreakable material. [citation needed]
Faceted glass. A faceted glass or granyonyi stakan ( Russian: гранёный стакан, literally faceted glass) ( Ukrainian: hranchak гранчак, derived from грань, meaning facet) is a type of drinkware made from especially hard and thick glass and having a faceted form. It is a very widespread form of drinking glass in Russia ...
Glasses. Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears. Glasses are typically used for vision correction, such ...
That feels exorbitant; they're just flimsy pieces of plastic, after all, easily lost or broken. They should be $10 apiece, maybe three for $20. Still, there's no denying the appeal of glasses that ...
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