WBEZ brings you fact-based news and information. Sign up for our newsletters to stay up to date on the stories that matter.Envy is one of the most unpleasant of all human emotions. It also turns out to be one of the most difficult for researchers to study. And yet, there’s mounting evidence that envy is a powerful motivator. This week, we explore an emotion that can inspire us to become better people — or to commit unspeakable acts.