We’ve all heard that before. The trick, however, is figuring out how to live gratefully. As I’m sure many would attest, it’s far too easy to over-invest in our frustrations, angst, worries, and so on.

Achor–quite possibly the funniest and most entertaining scientist you will ever see on a TED Talk stage–has spent years studying happiness and says you can boost your happiness to new levels with a ...