My paper which, two weeks ago, was on Grotius and slavery, is now a paper on humanitarian intervention and customary international law. With no Grotius or slavery. This is an academic Ship-of-Achilles: at what point did it stop being the original paper?
I will, however, eventually write the Grotius-on-slavery paper, which I think has significant implications for his idea of human relationships and the role of natural law (not that big!).