A new study finds American adults are lagging behind other countries when it comes to basic skills like reading and math. The Program for International Assessment of Adult Competencies tested about 166,000 people in more than 20 countries, and Americans scored below average. What does this say about the U.S. education system? What does that say about America's ability to compete in the world? Amanda Ripley, author of the book 'The Smartest Kids in the World: And How They Got That Way,' joins the AC360 Later panel.