Humans have been using nanotechnology for a long time without realizing it. The processes of making steel, vulcanizing rubber, and sharpening a razor all rely on manipulations of nanoparticles. The term "nanotechnology" was coined by Prof. Eric Drexler, a lecturer, and researcher of nano-technology. "Nano" is derived from the Greek word "dwarf." Nanotechnology is a term that encompasses all fields of science that operate on the nanoscale. The basic idea of nanotechnology, used in the narrow sense of the world, is to employ individual atoms and molecules to construct functional structures.