Part 1 of Essay
A bulletproof vest is a protective covering worn to protect the torso against bullets. Body armor fell into disguise in the sixteenth and seventeenth centuries, partly because it was ineffective against bullets. Modern body armor reappeared during World War I as a means of protecting the torso from shell fragments, but th ....

Part 2 of Essay
.... carbide. However, the discovery that numerous layers of nylon fabric could dissipate the energy of the bullet revolutionized the use of modern body armor. The function of steel or hard plastic armor is to be impervious to a bullet. The function of ceramic armor is to slow the bullet abruptly by the hardness of the ceramic and to dissipate the bullet's energy as it destroys the armor at the point of impact; the tiles or plates of ceramic bulletproof vest thus have to be replaced once they have stopped ....