Political instability is rattling countries across Latin America, pushing millions of migrants to head north in search of a better future. Ian Bremmer examines that dynamic and interviews Moises Naím, a syndicated Venezuelan columnist who used to run Foreign Policy magazine.

After eight years of civil war in Syria, with hundreds of thousands of its citizens dead and millions more fleeing the country, one question looms large: how did things get so bad? During those early days of peaceful protest, what prompted a shoot-to-kill order from the highest levels of government? The answer begins with the rise to power of the Assad family.

Ian Bremmer sits down with Harvard Astrophysicist Avi Loeb to examine cutting-edge research on the galaxies -- everything from interstellar travel to black holes.