Lightbulb

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A lightbulb, also known as an incandescent lamp, is a glass bulb encasing a source of illumination.

The light is created by an electric current passing through through wire to a metal filament, creating heat and incandescence (bright light).

Experimentation with incandescent lamps began in the early 19th Century. Thomas Edison is credited with "inventing the lightbulb"--that is, patenting an improved, commercially-viable lightbulb.