As Adolf Hitler pulled the world ever closer to conflict in 1939, Mohandas Gandhi wrote him a personal letter, urging him to pull back from the brink 'for the sake of humanity'. The German dictator never received the letter because it was intercepted by the British government - but it's been published in a book called Letters Of Note, along with many other remarkable missives. Here we've selected some of the most memorable. Along with Gandhi's letter they include a child's dietary advice for President Nixon, a tongue-in-cheek reply to a fan from Steve Martin and a letter from the...