Aug. 6, 2015 is the 70th anniversary of Hiroshima atomic bombing. 70 years ago, a nuclear bomb “Little Boy” was dropped on Hiroshima by an American B29 bomber and a total of 140,000 people were killed by the end of the year. In the same year on Aug. 9, a US Boeing B29 Superfortress Bockscar dropped a plutonium bomb “Fat Man” in Nagasaki, killing over 73,000 Japanese.