The second and last atomic bomb ever to be dropped in anger was code-named 'Fat Man'. It was dropped on the Japanese city of Nagasaki on August 9th 1945. The device was a solid core of plutonium compressed to a critical density by detonating shaped explosive charges arranged around it.
'Fat Man' produced a yield equivalent to about 21 kilo tonnes of conventional explosives and killed nearly 40,000 people, injuring a further 25,000.
On August 15th 1945 Japan surrendered to American and allied forces in the Pacific ending the Second World War and ushering in a new 'Atomic Age'.