Minerva visits the ileum, where her true mission is revealed. "Good science isn’t really about proving yourself right. It’s about trying to prove your ideas wrong..." Right... Meanwhile, in the real world, Michiel explains why it will take another week before he takes us back to Berlin...

Biopolis - into the microbiome is created by Michiel van Poelgeest for the Max Delbrück Center. Script consulting by Jeff Emtman, additional narration by Colette Kinsella.