Changes

==== Communication ====

==== Communication ====

*[[Data storage device]], any physical material that records or holds recorded information

*Data storage device, any physical material that records or holds recorded information

** [[Art medium]], materials and techniques used by artists to produce art works

** Art '''medium''', materials and techniques used by artists to produce art works

*[[Transmission medium]], in physics and telecommunications, any material substance which can propagate waves or energy

*Transmission '''medium''', in physics and telecommunications, any material substance which can propagate waves or energy

**[[Optical medium]], material through which [[Electromagnetic radiation|electromagnetic waves]] propagate

**Optical '''medium''', material through which [[Electromagnetic radiation|electromagnetic waves]] propagate

====Economics====

====Economics====