There are lots of things that can contribute to happiness and fulfillment, and they vary with each individual. A 75-year-long study, however, has found one common element that's believed to play a pivotal role in most people's genuine, longstanding happiness.

Good ol' fashioned friendship.

This study, which is considered the longest ongoing study on human happiness, started at Harvard University in 1938 with 724 men, 60 of whom are still alive today (women were added later because misogyny). After decades of observation, one of the study's leaders, Robert Waldinger, came to this conclusion:

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