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The unbreakable glass of ancient Rome, also known as flexible glass, was a invented by a man who subsequently beheaded by Tiberius Caesar, who feared the price of gold and silver would drop. Tiberius had the man's workshop destroyed as well, and the unnamed inventor took his secret to the grave. So what if this hadn't happened, and Tiberius had allowed the inventor to live? This 'flexible glass' could have been something along the lines of a cellulose-based plastic, or more likely the 'unbreakability' comes from an addition of borax acid, which was naturally occuring and in the region. So what would have been the effect of this unbreakable glass on the history of the world?