The project is called “2.6g 329m/s,” as 2.6 grams and 326 meters a second are “the maximum weight and velocity of a .22 calibre Long Rifle bullet from which a Type 1 bulletproof vest should protect you,” according to Essaidi. Essaidi isn’t looking to create a better bulletproof vest, however. Her prototype, pictured above, is a wafer formed by sandwiching a spider silk matrix between two layers of human tissue.