American Airlines Flight 191 crashed in Des Plaines, Illinois, due to a faulty maintenance procedure before takeoff. 273 people died.To get more news about bulletproof zone, you can visit bulletproofboxs.com official website.

In 1981, an elevated walkway collapsed in a Hyatt Regency Hotel in Missouri due to an engineering error. 114 people died.

In 2021, a condominium in Florida collapsed-partly due to poor safety inspection practices-killing over 100.

A list of human-error related engineering mistakes and disasters could fill thousands of pages. Manufacturers and various companies make mistakes and people die.

Due to the imperfect nature of human endeavors, government standards exist for all consumer products and services in the United States. Whether it's the Food and Drug Administration verifying the safety of food, the National Highway Traffic Administration certifying the safety of automobiles or doctors being reviewed by State Medical Boards, every profession has standards its practitioners must comply with, and live up to, if they want to continue doing business in their industry. It's the law.

In the world of personal-protection consumer products, such as bulletproof vests, shields, helmets and the like, the National Institute of Justice (NIJ)-an agency within the Department of Justice-is the regulating authority. Only the most durable, quality and proven bulletproof vests earn the elusive NIJ certification.
Firearms were first used in combat around the 800 years ago. Back then, there was heavy metal armor plating that could provide varying degrees of protection, although it was generally bulky, and if a soldier fell in a body of water, they were certain to drown. Over time, guns have become exponentially stronger, and the need for adequate physical protection has increased in parallel.

The first commercially available bulletproof vests were made of silk circa 1900. Fourteen years later, during World War 1, the need for widely available body armor only increased. Unfortunately, most soldiers of that era never received the protection they needed.

During World War 2, flak jackets became popular in the military, but they still failed to prevent bullets and shrapnel from doing extreme damage. It was becoming increasingly clear bulletproof vest technology was failing to keep pace with the destructive power of firearms and artillery.
Flak jackets became more advanced by the Vietnam War. They weighed about 22lbs and consisted of heavy armor plates woven together by strands of ballistic nylon, providing nominal safety from shrapnel and small-arms fire. However, they could not generally stop rifle caliber bullets.

Kevlar, a heat-resistant plastic, first became available to the public in the early 1970s. Marketed as "tougher than steel", Kevlar dominated the bulletproof vest industry for the remainder of the 20th century.

At the turn of the century, enterprising engineers began to realize the shortcomings of Kevlar and traditional bulletproof plates. A Kevlar bulletproof vests' average price tag was over $1000, and it was still too heavy and failed to stop high-velocity rifle calibers.

Soon enough, some inventors realized they could make bulletproof materials from aramids which are heat-resistant, synthetic fibers. Along this line of thought, a brand-new, thermoplastic polymer became widely-known and available: polyethylene. This material was stronger, lighter and more cheaply manufactured than Kevlar.

Nowadays, every top-notch bulletproof vest is made, at least in part, by polyethylene. The viability of new materials continues to be explored (firearms continue to become more powerful). Most new vests also have polyester components, which is a strong fiber that can be used to hold the plated sections of a bulletproof vest together.