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The World’s First Uncuttable Metal, Named “Proteus,” May Have Been Developed By European Engineers. The Metal’s Cellular Structure, Filled With Ceramic Spheres, Blunts Any Cutting Object Making The Metal Suitable For Thief-Proofing Chains And Locks. The Cellular Skin Of Grapefruit And The Shells Of Molluscs Inspired The Metal Molecules.

Worlds first uncuttable metal could spell trouble for b… | Visordown

https://www.visordown.com/news/industry/worlds-first-uncuttable-metal-could-spell-trouble-bike-thieves

World’s first ‘uncuttable’ metal created and it’s inspired by grapefruit and shells and could be used to make unbreakable bike locks