" English, in this light, is the odd one out, and what distinguishes it from its relatives is that it underwent marauding hordes of Vikings who never went home, and proceeded to speak the language, as they did so much else, Their Way. They never wrote down that they were doing so—most of them couldn’t write anyway. But Icelandic stands as virtual confirmation that adult learners screwing things up was a key factor in how English came to be the way it is. The people who can still read ancient sagas live on a remote, undisturbed island. The people whose language became the most user-friendly member of the family live on an island nearer the Continent, that was, due to that proximity, lustily disturbed by invading migrants. "

― John McWhorter , Our Magnificent Bastard Tongue: The Untold History of English