What Happens When You Mix,

the skin of a grapefruit and the shells of the abalone mollusk?

 you come up with a material called Proteus, an international team of researchers claim to have created the first synthetic cut-proof material that actively destroys the tool trying to cut through it, engineers at Durham University in England and the Fraunhofer Institute in Germany have come up with a new material that they say is extremely hard to cut through, the revolutionary synthetic material is inspired not by diamonds and sapphires, the toughest natural materials known to man, but by the cellular skin of the grapefruit and the fracture resistant shells of the abalone mollusk,

Proteus is made from alumina ceramic spheres encased in a cellular aluminium, metallic foam structure, and works by turning back the force of a cutting tool on itself. In the tests performed by its inventors, Proteus could not be cut by angle grinders, drills or even high-pressure water jets, “Essentially cutting the material is like cutting through a jelly filled with nuggets,” an article on the Durham University website reads, “If you get through the jelly you hit the nuggets and the material vibrates in such a way that it destroys the cutting disc or drill bit.”

having used angle grinders on many occasions, this video showing how Proteus eats the disc is amazing, Dr. Stefan Szyniszewski, Assistant Professor of Applied Mechanics, in the Department of Engineering, Durham University, added, “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,” 

apparently, when cut with angle grinders or drills, “the interlocking vibrational connection created by the ceramic spheres inside the casing blunts the cutting disc or drill bit,” an effect made painfully obvious by a video shot during tests, high-pressure water jet tools are remarkably ineffective against Proteus as well, because the curved design of the ceramic shells encased in the metallic foam widens the water jet, substantially reducing its speed and cutting power, Proteus is technically not impossible to cut though, tools will damage it, but it will use their own force against them and damage them even more, You will eventually cut through it with an angle grinder, but you will need a lot of discs to do so, as this material will eat through them like butter, instead of the other way around, the inventors of Proteus are confident that, as the world’s first man-made non-cuttable material, it will have could have lots of useful applications, such as to make bike locks, protective gear for people who work with cutting tools, or light armor, all of that from grapefruit and abalones, amazing!