Is Twitter's new CEO heading toward a glass cliff?

Her appointment renewed questions about the “glass cliff,” a theory that women — as well as underrepresented minorities — are more likely to be hired for leadership jobs when there's a crisis, which sets them up for failure. The term was coined in 2005 by the University of Exeter professors Michelle Ryan and Alex Haslam, and there have been plenty of famous examples since then, from Yahoo's Marissa Mayer to the U.K.'s Theresa May.