The article "Freezing as a Path to Build Complex Composites" by Sylvain Deville, Eduardo Saiz, Ravi K. Nalla, and Antoni P. Tomsia, published in Science, explores the use of freezing to create sophisticated porous and layered hybrid materials. The authors leverage the physics of ice formation to develop composites that mimic the intricate structure of nacre and bone, achieving high strength and toughness. By controlling the freezing kinetics and patterns, they can fabricate layers as small as 1 μm, creating structures with relevant dimensions ranging from 1 μm to 200 μm. These materials exhibit similar meso- and micro-structures to nacre, with parallel inorganic layers and homogeneous inorganic components. The composites are filled with a second phase, such as an organic or inorganic material, to enhance their mechanical properties. The technique is particularly promising for applications in orthopedics, where it can produce highly porous scaffolds with improved strength and bone-like properties, addressing the limitations of current implant materials.The article "Freezing as a Path to Build Complex Composites" by Sylvain Deville, Eduardo Saiz, Ravi K. Nalla, and Antoni P. Tomsia, published in Science, explores the use of freezing to create sophisticated porous and layered hybrid materials. The authors leverage the physics of ice formation to develop composites that mimic the intricate structure of nacre and bone, achieving high strength and toughness. By controlling the freezing kinetics and patterns, they can fabricate layers as small as 1 μm, creating structures with relevant dimensions ranging from 1 μm to 200 μm. These materials exhibit similar meso- and micro-structures to nacre, with parallel inorganic layers and homogeneous inorganic components. The composites are filled with a second phase, such as an organic or inorganic material, to enhance their mechanical properties. The technique is particularly promising for applications in orthopedics, where it can produce highly porous scaffolds with improved strength and bone-like properties, addressing the limitations of current implant materials.