Sunao Tsuboi was on his way to college when he was caught in the blast at Hiroshima on August 6, 1945, suffering burns all over his body. On the day the bomb went off, the engineering student was 20 years old.
Tsuboi taught mathematics at schools in Japan, telling youngsters about his experiences during the war. Pupils nicknamed him "Mr. Pikadon" ("Mr. Flash-Boom").
Tsuboi developed cancer and other illnesses, spending his working life in hospital being treated for anemia. Some 127,000 survivors of the nuclear bomb attacks on Hiroshima and Nagasaki are still alive.
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