Hiroshima, 6th August 1945
"Little Boy" was the codename for the atomic bomb dropped on Hiroshima on August 6, 1945 by the Boeing B-29 Superfortress Enola Gay. It was the first atomic bomb to be used as a weapon. The second, the "Fat Man", was dropped three days later on Nagasaki. It has been estimated that 130,000 - 150,000 persons had died by the end of December 1945. *Photo by Yoshito Matsushige from 1.6 miles away.
'Fat man' was a fusion bomb that was dropped on Nagasaki- it was approximately 20,000 times more powerful than its fission 'Little Boy' counterpart (which was released on Hiroshima.) Hiroshima was on flat ground so the bomb's destruction continued outwards (which made 'Little Boy' seem more powerful than 'Fat Man') but 'Fat Man' was actually far more powerful- it was just more constrained by the landscape as Nagasaki was in a valley.