Caffeine; "Nymphomaniac"; Ethnic Cleansing in Greece and Turkey; Please Explain

Charlotte Gainsbourg in "Nymphomaniac," directed by Lars von Trier

On today’s show, we’ll find out about America’s favorite addictive drug, caffeine. Charlotte Gainsbourg and Stellan Skarsgård talk about starring in Lars von Trier’s controversial new film, “Nymphomaniac.” We’ll also take a look at why, in the early 1920s, 1.2 million Greek Orthodox people were expelled from Turkey and 400,000 Muslims were expelled from Greece. Plus, this week’s Please Explain is all about medical marijuana.