Nanotechnology revolves around the creation of technology — films, materials, devices, applications and systems — on a scale of 1–100 nanometers. But what is a nanometer? A nanometer is one billionth of a meter or 40 billionths of an inch. A human hair is between 50 and 100 microns wide — and a micron is 1,000 nanometers. A DNA molecule is about 2½ nanometers wide. A typical human hair is between 50,000 and 100,000 nanometers wide. So, we could stack at least 1000 nano-devices across the end of a human hair.