There's a particular kind of unhappiness that's hard to spot. It doesn't arrive with a big crisis, or a breakdown, or any of the obvious things we've been taught to watch out for. It just sits there, quietly, for years. You go to work. You see your friends. You make dinner. You tell everyone you're fine. And after a while you've been saying you're fine for so long you can't really tell anymore whether it's true. Probably because you've also been saying it to yourself, in your own head, several thousand times. I lived with this kind of unhappiness for [...]