Little Boy was developed by Francis Birch's group at Los Alamos Laboratory. Successor to plutonium-fueled Thin Man design abandoned in 1944. Used uranium-235 enriched uranium as fuel with gun-type fission mechanism. Bomb contained 64 kilograms of uranium, with less than 1 kilogram fissioning
Pacific War ended with Japan's surrender on August 15, 1945. Manhattan Project produced Little Boy and Fat Man atomic bombs. 509th Composite Group trained on B-29s for atomic bombing missions
Eleanor Coerr's story follows Sadako Sasaki in post-war Hiroshima. Sadako falls ill with radiation-induced leukemia after atomic bomb. Story inspired by Japanese legend about folding thousand paper cranes
Manhattan Project developed atomic bombs for WWII after Germany's surrender. Project led by Robert Oppenheimer, known as "father of atomic bomb". Little Boy and Fat Man were first atomic bombs used in warfare
Motou Marumaru guides visitors through Hiroshima's unique nightscapes. Three areas offer different nightscape experiences: Hiroshima City, Kure, and Onomichi. City features river shadows and indirect light effects. Onomichi showcases time flow, Kure displays harbor lights
Sadako Sasaki was two years old when Little Boy was dropped on Hiroshima in 1945. The bomb killed approximately 350,000 people in Hiroshima. Sadako and her family escaped the city fires and radioactive rain. Her grandmother disappeared while retrieving family heirlooms