Geo is a bacterium living underground in a watery cave with his children. When the cave gets too crowded Geo discovers a new way to make everyone happy. One of a series of illustrated STEM books for early readers introducing children to the extraordinary and foundational hidden universe of microbiology. Based on the ability of bacterium Geobacter metallireducans to respire solid iron oxide using cell extensions called pili this subterranean science story written by Professor Mike Manefield and illustrated by Georgina Joyce introduces children to the idea that bacteria can 'breathe' much more than oxygen. This soft cover saddle stitched book has 20 pages, measures 16x16 cm and includes non-fiction information about the story plus an image of the bacterium the narrative is based on. Perfect for reading to infants or for children learning to read. Even university students find them helpful to start imagining life on a microscopic scale.