On this day 75 years ago, the US had dropped the first of its two atomic bombs on Japanese cities — the first, in Hiroshima, killed more than 70,000 people instantly. A second bomb, which was dropped three days later over Nagasaki, killed 40,000 more. The nuclear warfare put paid to the World War II and a devastating chapter in world history. Here's what you need to know about the Hiroshima and Nagasaki attacks.
What happened in Hiroshima and Nagasaki
On the morning of August 6, at 8:15 am local time, a B-29 bomber Enola Gay dropped the atomic bomb,

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