There are about a hundred trillion microbes living inside your intestine — protecting you from illnes, expediting digestion and regulating your immune structure. As our bodies have adapted to life in modern civilization, we’ve started to lose some of our ordinary microbes; at the same time, diseases links between a loss of diversity in microbiome are skyrocketing in developed societies. Computational microbiologist Dan Knights shares some intriguing findings about the differences among the microbiomes of beings in developing countries compared to the US, and how they might affect our health. Learn more about the world of microbes living inside you — and the work being done to create tools to restore and replenish them.

Read more: ted.com.