The natural safeguarding of vital human organs has been ingeniously provided by nature. Fat layers and ribs serve as a protective armor, shielding essential organs, while the brain is encased in robust bony plates. Interestingly, in men, these plates have an average thickness of 0.25 inches [6.5 mm], and in women, they are slightly thicker at 0.27 inches [7.1 mm]. This natural defense is deemed adequate for the typical hazards encountered by primates.

However, nature did not foresee the emergence of ideas leading to the invention of metal smelting and weapons capable of effortlessly breaching the 0.25-inch protection. Throughout history, humans have crafted an array of astonishing helmets, such as the ancient one made from 140 wild boar tusks. This narrative explores intriguing aspects, delving into why Romans fashioned helmets resembling human faces, identifying the pinnacle of head protection evolution, and uncovering the reasons behind the disdain for the Crusaders' helmets.