Hello and welcome to World War 2 Stories. I'm your host, Steve Matthews. Today, we're examining one of the most consequential and controversial events of the Second World War – indeed, of all human history: the development and use of atomic weapons against Japan in August 1945.

In the span of three days, two bombs – one uranium, one plutonium – obliterated two Japanese cities, killed over 200,000 people, and forever changed warfare, international relations, and humanity's relationship with technology. These were not merely new weapons – they represented a fundamental shift in our species' capacity for self-destruction.