Our guest is the science journalist, author, and editor Katherine Harmon Courage, whose new book -- which she tells us about -- is "Cultured: How Ancient Foods Can Feed Our Microbiome." What is the best way for us to feed, and to care for, our all-important microbiome -- and what is a microbiome, anyway? Courage investigates such questions by way of ancient food traditions as well as the latest research for maintaining a healthy gut. (Please note that Katherine Harmon Courage will do a free-to