Industrial scale war increased the speed of technological development. Nuclear weapons were made which could destroy whole cities. The used the power of to give out huge amounts of . They are often called or atom bombs. Around 50 years ago an atom bomb was dropped on the Japanese city of Hiroshima, killing 100 thousand people and spreading pollution around the world. This day of shame and horror should have made scientists stop and think what they were doing. It did not seem to. Instead they competed with each other to make even bigger bombs. Later bombs used a nuclear explosion to trigger , the same process which powers the and other . These are often called bombs.
Image taken from plane which dropped the atomic bomb on Nagasaki, Japan, 9 August 1945
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