brainstorm ...

lightbulb ... often a symbol or visualization of an idea. it is a device that produces visible light from electric current. It is the most common form of artificial lighting and is essential to modern society. Before electric lighting became common in the early 20th century, people used candles, gas lights, oil lamps, and fires. The total amount of artificial light (especially from street light) is sufficient for cities to be easily visible at night from the air, and from space. This light is the source of light pollution that burdens astronomers and others.

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