when was the first piece of clothing invented
Clothing There is no easy way to determine when clothing was first developed, but some information has been inferred by studying lice which estimates put the introduction of clothing at roughly 42,000â€“72,000 years ago.[1][2][3][4] [5]
Bulletproof vest In 1971, research chemist Stephanie Kwolek discovered a liquid crystalline polymer solution. Its exceptional strength and stiffness led to the invention of KevlarÂ®, a synthetic fibre, woven into a fabric and layered, that, by weight, has five times the tensile strength of steel.[23] In the mid-1970s, DuPont the company which employed Kwolek introduced Kevlar. Immediately Kevlar was incorporated into a National Institute of Justice (NIJ) evaluation program to provide lightweight, able body armor to a test pool of American law enforcement officers to ascertain if everyday able wearing was possible. Lester Shubin, a program manager at the NIJ, managed this law enforcement feasibility study within a few selected large police agencies, and quickly determined that Kevlar body armor could be comfortably worn by police daily, and would save lives.