Barack Obama became the first current President of the US to visit Hiroshima. He lay a wreath at the memorial park, said a speech to commemorate the victims and met several citizens who survived in the atomic bombing. Among them, was a 91-year-old sunao Tsuboi, a retired teacher. On the morning of August 6, 1945, when the American plane dropped a nuclear bomb called 'Little Boy' on Hiroshima, Tsuboi was walking to school from a cafe and suffered serious burns. Radiation caused him to have aplastic anemia. He had 11 prolonged stays at the hospital and has to have a blood transfusion every two weeks.