Vision of the Future

Framed pictures are of: Little Boy - 1945, Fat Man - 1945, Trinity - 1945, Oak - 1957. "The bombs killed as many as 140,000 people in Hiroshima and 80,000 in Nagasaki by the end of 1945." "The release was uneventful, and the gravity bomb known as 'Little Boy', a gun-type fission weapon, took 57 seconds to fall from the aircraft to the predetermined detonation height about 1,900 ft above the city. It created a blast equivalent to about 13 kilotons of TNT. The U-235 weapon was considered very inefficient, with only 1.38% of its material fissioning." If that's not considered "efficient," I'm scared to know what is.