Music is an art form whose medium is sound and silence.
Secret #5 5 Points
A mobile phone (also known as a cellular phone, cell phone and a hand phone) is a device that can make and receive telephone calls over a radio link whilst moving around a wide geographic area.
Secret #25 5 Points
The incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current through it, until it glows.
Secret #45 5 Points
A clock is an instrument used to indicate, keep, and co-ordinate time.