Uranium-235 is slightly lighter in mass than the remaining uranium ore. Separation techniques capitalize on this difference. For example, one method -- gas centrifuge enrichment -- spins gaseous uranium hexafluoride in cylinders, so the lighter uranium-235 moves toward the inner wall, where is it collected.
(For more information, see the Wisconsin Project "Bomb Facts: How Nuclear Weapons are Made," http://www. Wisconsinproject. More.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.