Taking my fellow editor Carrie's advice, I decided to eschew a long list of resolutions, instead choosing a one-word mantra I could use to improve my life in 2016. The word I went with? Connect. And it turns out, my one-word mantra/new year goal might put me on the right track for more happiness this year, if this 75-year-long study is right.

"So what have we learned? What are the lessons that come from the tens of thousands of pages of information that we've generated on these lives? Well, the lessons aren't about wealth or fame or working harder and harder. The clearest message that we get from this 75-year study is this: Good relationships keep us happier and healthier. Period."

— An excerpt from Robert Waldinger's recent TED talk, "What makes a good life? Lessons from the longest study on happiness"

So, there you have it. A way to increase your happiness in 2016? Work on your relationships. Life partners, coworkers, in-laws, roommates, neighbors and more. Here's some of our best advice for cohabiting and cooperating with others:

Relationship and roommates

Find friends

Bring friends to you

Neighbors and landlords