August 6 marks the day the U.S. dropped an atomic bomb named "Little Boy" on the Japanese city of Hiroshima
Hiroshima
Bells have tolled in Hiroshima, Japan, to mark the 75th anniversary of the dropping of the world's first atomic bomb
Nagasaki and Hiroshima are the only instances nuclear weapons were used in human history against cities
Survivors, their relatives and other participants marked the 8:15 a.m. blast with a minute of silence
The bombing anniversary comes as Pyongyang and Washington are trading escalating threats
The nuclear threat has become relevant again
It survived the Hiroshima bomb!