This week How To Cover Money kicks off Series 2, Tips from Top Journalists. We caught up with Michael Grabell of ProPublica to talk about his recent investigative reporting series on the dangers temporary workers face in the United States. Grabell's series was awarded the 2014 Barlett and Steele Award for Investigative Journalism from the Donald W. Reynolds National Center for Business Journalism and he offers us some tips on data journalism and taking on big stories.