Ishrub
That's my name ....built like a truck
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Proteus becomes the world's first manufactured non-cuttable material
Researchers from the UK's Durham University and Germany's Fraunhofer Institute claim they've come up with the world's first manufactured non-cuttable material, just 15 percent the density of steel, which they say could make for indestructible bike locks and lightweight armor.

"Essentially cutting our material is like cutting through a jelly filled with nuggets" said lead author Stefan Szyniszewski, Assistant Professor of Applied Mechanics, in Durham's Department of Engineering. "If you get through the jelly you hit the nuggets and the material will vibrate in such a way that it destroys the cutting disc or drill bit.
"The ceramics embedded in this flexible material are also made of very fine particles which stiffen and resist the angle grinder or drill when you’re cutting at speed in the same way that a sandbag would resist and stop a bullet at high speed. This material could have lots of useful and exciting applications in the security and safety industries. In fact, we are not aware of any other manufactured non-cuttable material in existence as of now."