"1984 isn't just a novel; it's a key to understanding the modern world. George Orwell's final work is a treasure chest of ideas and memes--Big Brother, the Thought Police, Doublethink, Newspeak, 2+2=5--that gain potency with every year. Particularly in 2016, when the election of Donald Trump made it a bestseller ("Ministry of Alternative Facts," anyone?). Its influence has morphed endlessly into novels (The Handmaid's Tale), films (Brazil), television...