Researchers accidentally discovered the world's thinnest sheet of glass, just two atoms thick. Their chance finding — now immortalized in the 2014 edition of the Guinness Book of World Records, out this week — gives scientists a glimpse into the puzzling properties of glass, which behaves like both a solid and a liquid. Researchers at Cornell University and Germany's University of Ulm were creating graphene, one of the thinnest and strongest materials in the world. Sheets of graphene are just one carbon atom thick, with those atoms arranged in a honeycomb lattice. [Gallery of Wonders: The Weirdest World Records] Read more...More about Guinness World Records, Science, Glass, Us World, and Us