What is very curious with the so-called "non-Newtonian" materials is that they are undecided, they are constantly hesitating between liquid or solid reactions, depending on the amount of kinetic energy they receive. This somewhat schizophrenic behavior is potentially very interesting, it allows our playmobil for example to use this viscoelastic polymer as a trampoline for its jump, but its failed and soft reception irremediably causes its drowning in a paste that turned viscous. This laboratory curiosity today makes it possible to manufacture hulls of protection surprisingly effective, because flexible and light, but but which contracts to protect against violent shocks.