Everyone from our parents to our doctors often counsel us to be positive.
And just look at the tone on social media sites: be happy! Those negative emotions do have their uses, though.
Todd Kashdan and Robert Biswas-Diener point out how, in their book The Upside of Your Dark Side.
Robert Biswas-Diener joined us a few years back to demonstrate how those "negative" emotions can produce positive results. We rejoin that interview here.