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Well, first of all, to clarify: Thomas Edison developedthe light bulb, and several other people were working on it at the same time. How Edison changed the world was to make electric lighting practical and inexpensive for everyone. However, had he not been forced (mostly by the work of Westinghouse) to go to alternating current, electric lighting would have never become the success it did. Edison insisted (wrongly) that electric lighting should be DC, not AC.

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Q: How do you think Thomas Edison's invention of the light bulb changed the world?
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