Today's show is an encore of one of our favorites from the summer. We’ll learn how to build a roof farm from two people who've done just that in Greenpoint, Brooklyn. Then, James McWilliams discusses the conflicting and confusing messages about how to eat an ethical diet, from buying local produce to eating farmed fish. Also, David Mitchell, named by Time magazine as one of the most influential novelists in the world, talks about his latest work, The Thousand Autumns of Jacob de Zoet. Plus, Please Explain is all about Lyme disease!