Another update:

BBC Hiroshima

BBC Hiroshima - Did you know? (Interesting facts)

The atomic bomb was the equivalent of 67 million sticks of dynamite, or 20,000 tons of TNT.

Even Japanese school girls were trained to fight enemy American troops with sharpened bamboo sticks.

Japanese medics were trained to be suicide bombers. They were to strap themselves with bombs and crawl under enemy tanks to detonate.

The Americans left the large city of Hiroshima untouched by the usual air raids they carried out, so as to measure the full extent of destruction of the atomic bomb. They saved the best for last.

In the testing of the atomic bomb in New Mexico, the destruction was estimated to be within a 3-mile area. The flash of explosion was seen from 10 miles away the detonation point. A soldier 10,000 feet away was knocked off his feet due to shock waves of the impact. Another soldier more than 5 miles away was temporarily blinded by the huge flash created by the explosion.

Each American Air Force soldiers and personnel involved in the dropping of the atomic bomb in Hiroshima was given a suicide pill of cyanide before take-off. This was to ensure that nothing would leak out if they were to fall in the hands of the Japanese.

Upon impact, those close enough were completely vaporised, casting "shadows" on debris they were standing or sitting on. Those slightly further were IMMEDIATELY turned to carbon in an instant.

Temperatures at the core of the explosion estimated to 4000 degrees Celsius.

The flash of the atomic bomb carried infrared radiation and gamma rays, which could attack human cells.

Some time after the bomb, it began to rain thick black fluids of ash mixed with the condensed water vapour in the clouds. Furthermore, the rain was highly radioactive.

The remaining survivors, badly burned and extremely thirsty, began drinking the raindrops that had fallen, not knowing the consequences. They were soon radiated by the rainwater, and died from an illness which caused them to rot from the inside out. It was radiation that killed the white blood cells in their bodies.

Final question: Was the bomb on Hiroshima a necessity? Or merely an experiment?