RT @mariopgrant: A Harvard and Columbia Study Reveals the Secret Trick to Efficiency and Happiness https://t.co/GqQ4CUyTFn https://t.co/AsmwniYaD3

A Harvard and Columbia Study Reveals the Secret Trick to Efficiency and Happiness https://t.co/GqQ4CUyTFn http://pic.twitter.com/AsmwniYaD3

— mariop grant (@mariopgrant) June 30, 2017