“Things Fall Apart.” Kurt Andersen asks Chinua Achebe, whose novel is a cornerstone of modern African literature, to reflect on his legacy. We’ll hear from one of Achebe’s successors, the acclaimed Nigerian writer Chimamanda Ngozi Adichie. Her new book of stories “The Thing Around Your Neck” is just out. And we take a look at how the late Andy Kaufman set the stage for today’s cutting-edge comedians — like Sacha Baron Cohen, the performer of Borat and the new Bruno.