Hey guys, When you are shot with a gun you get hurt even if you're wearing kevlar. In some cases you even break ribs or puncture a lung. Are there no solid substances out there that hardens proportionally with the kinetic energy that is applied? If that was woven into the vest it wouldn't impair movement since the kinetic energy applied to the fabric is relatively low with regular movement, but a bullet would make it harden and prevent the full force of the impact from affecting a small area on the body. Wouldn't this be possible?