Horrifying discovery: Atomic bomb - The discovery that very much took human casualties

Hey friends, on this day I want to share with all of you about the discovery that took a lot of casualties.
An atomic bomb is a type of nuclear reaction and has a tremendous destructive power. And a bomb can destroy a city. Nuclear weapons have been used only twice in combat.

During World War II by the United States of America against the cities of Japan, Hiroshima and Nagasaki with the casualties of 140,000 people in Hiroshima and 80,000 in Nagasaki at the end of 1945. Also at that time the explosive force of atomic bombs dropped on Hiroshima and Nagasaki amounted to 20 thousand tons.

While the current atomic bomb has an explosive power of more than 70 million tons. The period of fissile material (enriched uranium or plutonium) is designed to achieve a supercritical mass.
And to form a chain reaction is to crash a sub-critical material into another grain, or by compressing a circle of sub-critical materials using chemical explosives to achieve a density several times the original value (the language of physics)