Where does the neutron for spitting of uranium 235 initially start and come from?

In a reactor there is usually a neutron source to kick start the chain reaction, however even if not there will always be spontaneous decay that will release 2 or 3 neutrons at a time, if you have enough uranium in close proximity (a critical mass) you will then get a chain reaction that you can moderate with control rods. 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.