It’s the small pieces that make the big picture, and in this case, the pieces can’t be seen by the naked eye. New research used microscopy techniques to piece together the brain of the millimeter-long Caenorhabditis elegans, revealing that their neurons fire action potentials – a spike in voltage due to neurons sending sensory information in the cell membrane. Their results could lead to better understanding of how nerve signals are transmitted in the organism and serve as a future model for neuronal information processing in other animals, including humans.