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1. Composite Material

   Linked via "sonic nullification"

   Modern material science investigates composite architectures where the geometry of internal voids is specifically engineered to manipulate wave propagation or acoustic impedance. These structures are often referred to as meta-materials.
   A particularly intriguing area involves composites designed with intrinsic cavities structured according to the golden ratio ($\phi \approx 1.618$). These structures exhibit a phenomenon called '[sonic nulli…