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The world's thinnest sheet of glass is just a molecule thick, setting a new world record set to appear in the Guinness Worlds Records 2014 Edition. As so often the case, the invention was a serendipitous, born during the pursuit of something else altogether. The researchers, from Cornell University and Germany's University of Ulm, were making graphene, a 2D sheet of carbon atoms in chicken wire crystal formation, on copper foils in a quartz furnace when they noticed some kind of "muck" on it.