I think I would go for remarkable, since it is created especially for Rspec. Also it is extremely complete. Whereas Shoulda was created to get the rspec-style matchers inside Test::Unit.
Just an update, since the Rails world moves so fast: Shoulda seems to have garnered three times as many watchers, two times as many forks, and one and half as many contributors. Remarkable's last commit was over a year ago, and shoulda's was within this month. That said the last 5 contributions were basically small bugs or minor touch ups.
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.