The document discusses electron microscopes and nanotechnology. It focuses on the Scanning Electron Microscope (SEM) which uses electron beams to examine superficial areas of samples. SEMs allow magnification beyond 1000x since electrons have no wavelength. This enables viewing much smaller samples. The document also discusses how nanotechnology allows manipulation of systems 100 nanometers or smaller. Nanotechnology provides opportunities to study quantum confinement, chemical reactivity, and sensitivity changes. Applications include using nanoparticles for biomedical research like destroying cancer cells. Researchers are also developing fibers using nanotechnology that could eventually be implanted in humans.