If you were listening to Mark Zuckerberg's testimony in front of the Senate, you missed the sort of bewildered smile on the Facebook CEO's face as he explained to Sen. Orrin Hatch how his company makes money. Zuckerberg was still answering questions as we taped the show this afternoon, but we brought in Marketplace Tech host Molly Wood to talk about the story so far. Then, we'll look at another striking moment from this afternoon, when Zuckerberg said Facebook isn't a monopoly as it stares down regulation, here and abroad. Then: Toys R Us filed Chapter 11 bankruptcy last year, with more than $5 billion in debt on its books. But soon afterward, it asked the bankruptcy court for permission to pay big executive bonuses. That sounds remarkable, but it's actually pretty common. We'll look at why. Plus: One in three American families has trouble affording diapers. We'll look at why.