A Harvard psychiatrist says 3 things are the secret to real happiness

Happiness is one of the most important things in life, yet it's also one of the hardest to study.

Psychiatrist Robert Waldinger is the director of the Harvard Study of Adult Development, one of the longest and most complete studies of adult life ever conducted. Waldinger described some of the secrets to happiness revealed by the study in a recent TED talk.

The study followed two cohorts of white men for 75 years, starting in 1938:

268 Harvard sophomores as part of the "Grant Study" led by

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