During World War II the United States government launched a $2 billion project. This project, known as the Manhattan Project, was an effort to produce an atomic bomb. This project was taken on by a group atomic scientists from all over the world.
The first atomic bomb was not tested at all. It was dropped on Hiroshima, Japan on August 6, 1945 killing over 80,000 people and almost completely leveling the entire city. It destroyed more than 4 square miles, or 60% of the city. The flash of the blast was so intense it discolored the pavement and left imprints on the ground cast by the shadows of building and people. By studying these shadows scientists pinpointed the exact detonation point of the bomb.
The second atomic bomb was dropped just three days later on Nagasaki, Japan. 1/3 of the city was destroyed and 66,000 people were reported killed or injured. A memorial now marks the spot where the bomb exploded.
During the initial blast the A-bomb released about 85% of its energy as intense heat followed by a supersonic shock wave that is felt as a highly destructive high pressure air blast, which can easily demolish tall buildings, not to mention people. After the initial blast radiation covers the area, causing people, animals, and structures to practically disintegrate. Even years afterwards people were still dying and having health problems related to the radiation they were exposed to long before.
There were many people that were strongly opposed to the using of nuclear weapons on Japan. But invading the is land instead of bombing would have taken perhaps 1 million us soldiers lives.
After 1945 the US made thousand of atomic bombs and a wide range of small size nuclear weapons like, land mines, missiles, and grenades. By 1965 the larger countries of the world had also developed atomic weapons.
Today nuclear warheads are smaller...