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It’s tough to be strong: Advances in bioinspired structural ceramic-based materials (a) (b) (c) Figure 6. The helical structure of a narwhal tusk was replicated by applying a rotating magnetic field during freeze casting. (a) Microcomputed tomographic image of the top view of a sintered TiO2 scaffold; (b) section of a narwhal tusk; (c) artificial scaffolds formed by magnetic field-assisted freeze casting. National Laboratory for helpful discussions. The National Science Foundation Ceramics Program Grant No. 1006931, and a UCS, Academic Senate Bridge Grant (2013–2014) funded this work. About the authors Michael M. Porter is a doctoral researcher in the materials science and engineering program of the mechanical and aerospace engineering department at the UCSD. Joanna McKittrick is professor of mechanical and aerospace engineering at UCSD. Contact Joanna McKittrick at jmckittrick@ucsd.edu. References 1P. Fratzl and R. Weinkamer, “Nature’s hierarchical materials,” Prog. Mater. 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