Traditional materials or advanced artificially engineered metamaterials are incapable of effectively addressing the simultaneous challenges of impact energy hazards and low-frequency noise. There is an urgent need for multifunctional materials that can address this multi-physics field coupling problem. Herein. a hierarchical multifunctional chiral metamaterial (HMCM) is proposed for d... https://www.learningepistemology.com/product-category/first-aid-kits/