Tiny molecules, known as peptides, can assemble into honeycomb-like fibers filled with water. The blueprint for these fibers lies in a very short amino acid sequence, as researchers from the Max Planck Institute for Polymer Research, the University of Ulm, and Ulm University Hospital have now demonstrated. The blueprints provide rules for building ordered materials from very short molecular chains and a starting point for studying water in extremely confined spaces. The results have now been published in the journal Nature.