Environmental Protection. Didymo (Didymosphenia geminata), also known as rock snot, is a non-native invasive microscopic algae (diatom) that can produce large amounts of stalk material to form thick brown mats on stream bottoms. Didymo threatens aquatic habitat, biodiversity and recreational opportunities.
peripheral device - (computer science) electronic equipment connected by cable to the CPU of a computer; disk drives and printers are important peripherals.
Peripherals are the devices external to your computer that take in information, allow the computer to put out information in visible and audible form, and perform other important tasks. Devices such as printers, scanners, audio and visual equipment and external drives allow us to make full use of the computer's resources. All of these devices hook up electronically via cables or wireless connection to the main computer, but are separate from the main operating functions of the computer.