We’re each a big mush of chemicals surrounded by chemicals, and figuring out which of these chemicals are helpful, versus harmful, is complicated. Our executive producer, George Zaidan, takes on that challenge in his new book Ingredients: The strange chemistry of what we put in us and on us. I chat with him about some of what he found, and how he found it. Ingredients is on bookstore shelves now: https://www.penguinrandomhouse.com/books/599202/ingredients-by-george-zaidan/