The world's worst weapon - 80 years since the atomic bombing of Japan

The Atomic Bomb Dome stand in the Peace Memorial Park in Hiroshima serves as a reminder of the ruins left behind by the atomic bomb. — JINHEE MASAHIRO LEE/Sopa Images/Zuma Press Wire/dpa

Most children in the city of Kokura, Japan, know what the weather was like 80 years ago.

It was foggy on Aug 9, 1945 – a day that changed history forever.