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What is an electric light bulb? electric light bulbs were invented to replace Wax candles and lamps so people can see more in the dark and during work. - ppt download
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70+ Benjamin Franklin Electricity Stock Photos, Pictures & Royalty-Free Images - iStock | Thomas edison, Benjamin franklin kite, Telescope
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Who Discovered Electricity? - Universe Today
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Thomas Alva Edison: The Improvement of the Light Bulb
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