What evidence indicates that Supernovas exploded at the beginning of the Universe?

None - if supernova is exactly what you mean. A supernova is the end of the life cycle of certain stars. At the beginning of the universe there were no stars to go supernova yet.

While we don't know conclusively how the universe began, there is strong evidence it began with a 'Big Bang' where all the mass and energy we see spread around today were condensed into a region much too small for any stars to form. While people discuss the beginning of the universe, no model has a bunch of stars (from somewhere else? ) going supernova.

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.