In the social media age, sometimes it feels like the relevance of a single story lasts about as long as it takes to tweet about it. It can feel like a sensory overload, a near-constant "on to the next!" But once in a while you read a piece that seeps into your core, and sticks with you even months down the road. For the third year in a row, we've curated a list of pieces that stood out to us over the last calendar year.