A habit expert says people come in 4 types -- and figuring out yours is the first step to being happier

Improv at the Physick Estate/Flickr When you start asking questions about the best strategies for self-improvement, there's one frustrating sentence you'll hear over and over again: "It depends." It can sound like a cop-out, but in reality, there's no one, blanket technique that will help everyone lose weight, start exercising, be more productive, and spend more time with their family. It depends -- on things like your personality, your upbringing, and your biological predispositions. Few people...