You're never far from silicon. This material is used to make the computer chips inside cell phones, computers, MP3 players and other electronic devices. Even if you don't use these devices, silicon is just beneath your feet: It makes up more than one-quarter of the weight of the Earth's crust.
Silicon comes in many forms, from large rock crystals to tiny grains of sand. Now there’s one more: Scientists have created sheets of silicon that are only one atom thick. This creation is called silicene. If you zoom in far enough with a powerful microscope, each sheet looks like a honeycomb. Both structures are made of connected hexagons.
At a scientific...