The first thing to bloom again in Hiroshima after the blast was the oleander bush. The total death toll has been estimated at between 150,000 and 190,000.ġ0. Thousands more died of radiation poisoning and severe burns. Between 70,000 and 80,000 people were killed instantly. When 'Little Boy' exploded, it instantly destroyed about five square miles of Hiroshima.ĩ. The amount of uranium it took to spark the reaction was 0.7g - an amount about the weight of a paperclip.Ĩ. 'Little Boy' was a uranium-based bomb that weighed more than 9,000 pounds and was some 10 feet long. The blast was the equivalent of 15 kilotons of TNT.ħ. It detonated about 1,750 feet above the ground. The bomb, called 'Little Boy,' was dropped at 8:15 a.m. The name Hiroshima means 'wide island' in Japanese.Ħ. There were only three people on the Enola Gay who knew what the real mission was that day.ĥ. The plane that carried the bomb to Hiroshima was named the 'Enola Gay.' That was the name of the mother of the plane's pilot, Paul Tibbets.Ĥ. The Manhattan Project cost $2 billion. That's more than $26 billion in today's dollars.ģ. President Harry Truman ok'd the plan to drop the bomb on Hiroshima, and, three days later, to drop a second one on the Japanese city of Nagasaki.Ģ. Here are a few facts about the bomb and the effect it had on the world.ġ.