The image shows optical profilometry of undulating wavy enamel (= folded layers of parallel hydroxyapatite crystallites separated by thin layers of loosely aggregated inter-layer matrix) in the grinding dentition of hadrosaurid dinosaurs. Spherical indentations within the layers were used to determine combined structure property maps of this hierarchical structure. The unique morphology of the wavy enamel layering is the most complex enamel architecture known in any reptilian taxon. The periodic variations in properties between the layers, combined with the enamel layer undulations, is postulated to promote the remarkable fracture resistance, localized damage and strategically controlled crack directionality of this structure. Motivated by these findings we utilized key attributes from the dinosaurian enamel architecture to design new synthetic nano-layered metal-ceramic composites that strategically controls crack directionality. Our study exemplifies that fracture property preservation not only enables exploration of past functionality but can inspire modern material designs. Collaborators: Dr. Soumya Varma, Amruta Vaghela, Dr. Sid Pathak