Statistician Nic Marks has studied work relationships, happiness, and success for years. The findings reveal a lot about how we interact with people, the responsibility we're given at work, and how the happiness component can be changed. In fact, humans crave challenges. From personal satisfaction to work responsibilities, the relationships among being challenged, being happy, and being satisfied are correlated in ways you may never have realized. Source: my.happify.com/hd/inspiring-work-challenges-make-us-happier-at-work/