Dirt is Good: The Advantages of Germs for Your Child’s Developing Immune System answers parent’s questions about the microbiome and their kid’s health. Parents, hold on to your diaper bags, Dirt is Good: The Advantages of Germs for Your Child’s Developing Immune System seeks to answer microbiome-related parenting questions. Science writer Sandra Blakeslee teams up with microbiome scientists, Rob Knight, PhD and Jack Gilbert, PhD, to eloquently capture the answers to the hundreds of questions Rob and Jack have been asked by concerned parents. After a general introduction about the human microbiome, Dirt is Good starts with the interaction of the microbiome and human immune system in pregnancy. Continuing on through birth, first foods (both liquid and solid), the book touches on a range of topics organized loosely into chapters including the environment, conditions, depression, vaccines, and tests. There’s an amazing diversity of chapter topics. What Dirt is Good does well Talks candidly, clearly, and quickly about the current understanding of the microbiome and children’s health. Dirt is Good is clear about not overselling the microbiome and current probiotics. Throughout the book are stories of how their experience as parents and microbiome researchers change their ideas of cleanliness and health. What is