In 1878, Thomas Edison announced his intention to harness Niagara Falls and produce a safe, electric light system. He said he could do it in six weeks. Almost three years later, all the components -- bulbs, sockets, switches, wires, junction boxes -- were finally ready. The "Wizard of Menlo Park" may have revolutionized the world, but he was caught in a web of personal, patent and corporate battles, eventually losing control of the industry he founded.