From tortilla chips to tree bark, from fancy cheese to toe cheese, there’s a world of smells all around us that tells us a lot about food, drink, and everything else. So says legendary food scientist Harold McGee in his new book, Nose Dive: A Field Guide to the World’s Smells. Harold joins us to explain the connection between wet dog smell and fermented cabbage, and why we should have more “smell empathy” for others.