" the scientific advances made by early Middle Eastern cultures, one of them being our modern numbering system, whose advantages over Roman numerals included ‘positional notation’ and the invention of the number zero. Of course, Langdon always ended this lecture with a reminder that Arab culture had also given mankind the word al-kuhl—the favorite beverage of Harvard freshmen—known as alcohol. "

― Dan Brown , The Lost Symbol (Robert Langdon, #3)