Thomas A. Edison seen here in 1929 holding a replica of his first lamp.

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On December 31, 1879 Thomas A. Edison gave the first public demonstration of the incandescent lamp in Menlo Park. He is seen here in 1929 holding a replica of his first lamp, which had the power of 16 candles. In contrast, the lamp on the left had the power of 150,000 candles. (UPI Photo/Files)

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