While many inventors worked on electric light, Thomas Edison is credited with creating the first commercially viable incandescent light bulb. He did this by finding the right combination of a high vacuum and a carbonized bamboo filament that could burn for over 1,200 hours. Beyond the bulb itself, Edison developed the entire electrical power distribution system needed to make the invention useful to the public. The light bulb fundamentally changed human society by extending the productive day, improving safety in cities, and eventually replacing dangerous gas lamps and candles. It remains the universal symbol for an idea and was the catalyst for the widespread electrification of the world, leading to the development of countless other electrical appliances.