Michael Neuman of Doctors Without Borders talks about how his organization carries out delicate humanitarian negotiations in hostile environments. Conor Grennan discusses his work with victims of child trafficking victims in Nepal. The BBC’s A History of the World in 100 Objects continues with a look at an early flood tablet. Robert Harris talks about his best-selling novel The Fear Index. Plus, New Yorker staff writer Ryan Lizza explains what internal memos can tell us about the Obama Administration, and he’ll give us an update on the Florida Primary!