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Stories about: Thomas Edison

Say Good Bye To The Light Bulb! Since its invention more than 125 years ago, the light bulb has suffered relatively small changes in its design. It is probably the most inefficient device ever developed, since more than 90 to 95 percent of the energy it consumes during operation is spent on useless heat radiating from the tungsten filament, and onl... 20 December 2007 03:52 GMT