X-rays were initially used without proper safety precautions, leading to radiation poisoning and death in many cases.

The discovery of radioactivity by Marie Curie and others paved the way for the development of nuclear weapons.

Matches were a relatively new invention at the time and were often used carelessly, leading to fires.

The discovery of the germ theory of disease led to the understanding that diseases are caused by microorganisms, but it also led to the spread of deadly diseases due to lack of proper hygiene and sanitation.

Poison gas was used extensively in World War I, causing severe injuries and deaths among soldiers.

The discovery of nuclear fission by Otto Hahn and Fritz Strassmann in 1938 led to the development of the atomic bomb.

The Titanic was equipped with an iceberg detector, but it was not used properly, leading to the ship's collision with an iceberg and subsequent sinking.

The discovery of chlorine gas in the 18th century led to its use as a chemical weapon in World War I.

Early airplanes were often unreliable and prone to accidents, leading to the deaths of many pilots and passengers.

The discovery of bacteria in the 19th century led to the understanding that they can cause diseases, which paved the way for the development of biological weapons.

The Chernobyl disaster was caused by a series of design flaws and human errors at a nuclear power plant in Ukraine.

The discovery of sarin gas in the 1930s led to its development as a nerve agent during World War II.

Early automobiles lacked basic safety features, leading to many accidents and deaths.

The discovery of nuclear fusion in the 1950s led to the development of the hydrogen bomb.

Early dial-up modems were often unreliable and caused many people to lose their internet connection, leading to frustration and even death in some cases.