Uranium burned in Hiroshima bomb weighed less than a $1 bill
The world's first atomic bomb dropped on Hiroshima by the US on August 6, 1945, exploded inefficiently, burning a small portion of uranium and throwing 99% of it in the air. Of that small portion, the majority turned into other radioactive elements while the rest, which killed 80,000 people, weighed seven-tenths of a gram, less than a $1 bill's weight.