Scientists have discovered the surprising strength of a sheet of nanoparticles that measures just 50 atoms in thickness. "It's an amazing little marvel," said one of the researchers. "This is not a very fragile layer, but rather a robust, resilient membrane." Even when suspended over a tiny hole and poked with an ultrafine tip, the membrane boasts the equivalent strength of an ultrathin sheet of plexiglass that maintains its structural integrity at relatively high temperatures.