Facebook’s CEO finally emerges to discuss the Cambridge Analytica scandal. Nike finally has a blowout quarter. Dropbox soars on its first day of trading. Jason Moser, Matt Argersinger and David Kretzmann discuss those stories, as well as the financial metric Wall Street is trying to keep secret.  Plus, award-winning columnist Morgan Housel reflects on how slowly we accept life-altering inventions and why we love a good story.  Thanks to Harry’s for supporting The Motley Fool. Get your Free Trial Set – go to www.Harrys.com/Fool.  And thanks to Casper for supporting The Motley Fool. Save $50 on a mattress at http://www.casper.com/fool (use the promo code “Fool”).