In class we talked about how Gutenberg wasn't the person who invented movable type as the Chinese had it before him. That said, he was the one that made it popular in the Western world, which makes him largely responsible for the way it changed the history of printing. Thomas Edison was not the person who invented the light bulb. It was invented in 1806 by Humphrey Davy. Thomas Edison was the one who perfected the light bulb which in turn made it popular. That is why he is credited. The Apple iPod wasn't the first Mp3 player.