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Title: umm...Thomas Edison invented the light bulb.
Review: Watt did not invent the light bulb. Watt did not invent the steam engine either. He improved it and helped spread its applicability to industry. He was an important member of the Lunar Society with his partner, Matthew Boulton, as well as Erasmus Darwin, John Whitehurst, James Small, etc. Another good book to get is Jenny Uglow's The Lunar Men (?), which is about this circle of interesting guys.
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