Grilled cheese, World War II and fiduciary have one thing in common: if you “Google” them, each prompts a Wikipedia entry as the No. 1 result. Wikipedia is all too convenient, but of what value is it? What good is a stockpile of information if it’s unreliable and often incorrect, as many have said Wikipedia is? Since its launch in 2001, the “The Free Encyclopedia” has grown exponentially, offering a definition (or more) for almost every topic. Last spring the resource reached the 10 million article mark over a spectrum of 20 different languages in its attempt to “summarize all...