"The late nineteenth century was a period of explosive technological creativity, but arguably the most important invention of all was Thomas Edison's incandescent lightbulb. Unveiled in his Menlo Park, New Jersey, laboratory in 1879, the lightbulb overwhelmed the American public with the sense of the birth of a new age. More than any other invention, the electric light marked the arrival of modernity. The lightbulb became a catalyst for the nation's...