This episode features the most cutting-edge scientists out there who are harnessing the power of what's called "The Microbiome: the full array of the trillions of microorganisms that live in or on the human body which help it function. Director: Emma Watts. Actors: Martin J. Blaser (Self), Jasper Buikx (Self), Jenn Cooper (Self), Delasie Dela-Seshi (Self), Maria Gloria Dominguez-Bello (Self) (2020)