Northwestern Researchers Uncover Mantis Shrimp's Punch Durability Mechanism
Researchers at Northwestern University, in collaboration with the Institute of Light and Matter in Lyon, have published a study in Science detailing how the mantis shrimp's dactyl club withstands its incredibly powerful strikes. The mantis shrimp delivers one of the fastest punches in the ocean, accelerating its club at a rate comparable to a .22 caliber bullet, creating a cavitation bubble that briefly reaches temperatures similar to the sun's surface. This dual impact, from the club and the collapsing bubble, is devastating to prey. The study, led by Nicolas Alderete and Horacio Espinosa, reveals that the club is not a solid mass but is composed of layers. An outer impact region of mineralized fibers arranged in a herringbone pattern resists cracking, while a deeper Bouligand structure, made of corkscrew-like fiber bundles, acts as a 'phononic shield.' This shield filters out high-frequency shockwaves that would otherwise damage the shrimp's soft tissues. The team used laser-based techniques, including t... 
