“Wikipedia, as nearly everyone knows by now, is a six-year-old global online encyclopedia in 250 languages that can be added to or edited by anyone. Wikipedia’s goal is to make the sum of human knowledge available to everyone on the planet at no cost. Depending on your lights, it is either one of the noblest experiments of the Internet age or a nightmare embodiment of relativism and the withering of intellectual standards. Love it or hate it, though, its success is past denying — 6.8 million registered users worldwide, at last count, and 1.8 million separate articles in the English-language Wikipedia alone — and that success has borne an interesting side effect.”