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The Light bulb By: Allyson Carter. Changed society, history, and everyday life. replaced fire –torches, candles, and oil and gas lamps The light bulb. - ppt download
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Negative thinking vs Positive thinking light bulb concept. dark background Stock Photo - Alamy
The End of Incandescent Light Bulbs Is Coming. Really - CNET
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When Nights Are No Longer Dark: Effects of Artificial Light at Night on Agroecosystems — LED professional - LED Lighting Technology, Application Magazine
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Bulletin #2227, Maine Poultry Facts: Lighting For Small-Scale Flocks - Cooperative Extension Publications - University of Maine Cooperative Extension
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