Journalist and author Fareed Zakaria hosts this in-depth look at the major global developments of the week (the title's "GPS" stands for "Global Public Square"), with an emphasis on new ideas and innovative solutions to the world's toughest problems. Each episode also features Zakaria leading a panel discussion and interviewing a major world figure.On Wednesday, President Trump became the third president in U.S. history to be impeached. How does his impeachment compare to those of Clinton and Johnson (and the almost-impeachment of Nixon)? Fareed is joined by an all-star panel of presidential historians to discuss, John Meacham, Tim Naftali, and Annette Gordon-Reed. Then, a rare bit of good news to round out your holiday season: global poverty (and especially extreme poverty) has shrunk considerably over the past few decades. That's thanks to the work of people like Ester Duflo and Abhijit Banerjee - a husband and wife team who just won the Nobel Prize for their work. Could the world actually eliminate extreme poverty? Masih Alinejad, Iranian journalist and activist-in-exile, comments on the recent unrest in Iran. Guests: John Meacham, Tim Naftali, Annette Gordon-Reed, Masih Alinejad, Ester Duflo, and Abhijit Banerjee.