Grab your squatty potty and put your squeamishness aside: we're going elbow-deep into human waste with science journalist and author Bryn Nelson. This episode digs into the microbiome, probiotics, and fecal transplants. It uncovers the surprising benefits and uses of human waste, from healing autoimmune conditions to fertilizing crops, and even the ancient practice of collecting and selling 'night soil'. Also: how many synonyms for poop can Ashley stomach? Find out.