A post-war model of ‘Little Boy’, the atomic bomb exploded over Hiroshima, Japan, in World War 2.

A post-war model of ‘Little Boy’, the atomic bomb exploded over Hiroshima, Japan, in World War 2.

A model of the Little Boy nuclear weapon dropped on Hiroshima, Japan, in August 1945. Credit: Everett Historical/Shutterstock

Everett Historical/Shutterstock