For over 80 years, researchers at Harvard have studied what makes for a good life. They found one surefire, scientifically proven predictor of happiness: developing warmer relationships. A team of reporters on The Times’s health and wellness desk, Well, developed a self-paced challenge to help you do just that. Ready to start the new year right? Start below!

How Strong Are Your Relationships?

Day 1: Take Stock of Your Relationships
Today, you will identify the areas of your life in which you would like to be more connected.

Day 2: The Secret Power of the 8-Minute Phone Call
Even a brief chat has measurable effects on our well-being.

Day 3: Small Talk Has Big Benefits
Regular exchanges with your “weak ties” will bring you more happiness.

Day 4: Why You Should Write a ‘Living Eulogy’
Happy people express their gratitude for others.

Day 5: The Importance of Work Friends
People who are close to their colleagues are happier and more productive.