On today's show: behavioral economist Dan Ariely talks about his recent study, which shows that Americans dramatically underestimate the level of wealth distribution and inequality in the country. Then, we’ll examine the ways in which human and ant societies are similar. Two comedians stop by to discuss their latest books: Gilbert Gottfried and then Demetri Martin. Plus, nearly 4 million children born in the United States have parents who are undocumented immigrants. We’ll examine the many challenges these families face and the current state of immigration policy.