If a PI or Co-PI has received previous MRI awards, does that make them ineligible to submit an MRI-R2 proposal?

No, there is no limit on the number of MRI projects in which a PI/Co-PI may participate, but please note that results from prior MRI awards (within the past five years) must be summarized in the current proposal. 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.