5:38 PM
A light bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes.Billions are in use, some even in outer space.. Early people used candles and oil lamps for light. Crude incandescent lights were made in the early and middle 19th century but had little use.
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thompson
Thursday, December 31, 2020